--- a/Gemfile.lock	Fri May 31 09:10:37 2019 +0900
+++ b/Gemfile.lock	Tue Oct 22 16:17:30 2019 +0900
@@ -2,54 +2,67 @@
   remote: https://rubygems.org/
   remote: https://rails-assets.org/
   specs:
-    actioncable (5.2.3)
-      actionpack (= 5.2.3)
+    actioncable (6.0.0)
+      actionpack (= 6.0.0)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
-    actionmailer (5.2.3)
-      actionpack (= 5.2.3)
-      actionview (= 5.2.3)
-      activejob (= 5.2.3)
+    actionmailbox (6.0.0)
+      actionpack (= 6.0.0)
+      activejob (= 6.0.0)
+      activerecord (= 6.0.0)
+      activestorage (= 6.0.0)
+      activesupport (= 6.0.0)
+      mail (>= 2.7.1)
+    actionmailer (6.0.0)
+      actionpack (= 6.0.0)
+      actionview (= 6.0.0)
+      activejob (= 6.0.0)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.2.3)
-      actionview (= 5.2.3)
-      activesupport (= 5.2.3)
+    actionpack (6.0.0)
+      actionview (= 6.0.0)
+      activesupport (= 6.0.0)
       rack (~> 2.0)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.2.3)
-      activesupport (= 5.2.3)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (6.0.0)
+      actionpack (= 6.0.0)
+      activerecord (= 6.0.0)
+      activestorage (= 6.0.0)
+      activesupport (= 6.0.0)
+      nokogiri (>= 1.8.5)
+    actionview (6.0.0)
+      activesupport (= 6.0.0)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
-      rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.2.3)
-      activesupport (= 5.2.3)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (6.0.0)
+      activesupport (= 6.0.0)
       globalid (>= 0.3.6)
-    activemodel (5.2.3)
-      activesupport (= 5.2.3)
-    activerecord (5.2.3)
-      activemodel (= 5.2.3)
-      activesupport (= 5.2.3)
-      arel (>= 9.0)
-    activerecord-jdbc-adapter (52.2-java)
-      activerecord (~> 5.2.0)
-    activerecord-jdbcpostgresql-adapter (52.2-java)
-      activerecord-jdbc-adapter (= 52.2)
+    activemodel (6.0.0)
+      activesupport (= 6.0.0)
+    activerecord (6.0.0)
+      activemodel (= 6.0.0)
+      activesupport (= 6.0.0)
+    activerecord-jdbc-adapter (50.0)
+      activerecord (>= 2.2)
+    activerecord-jdbcpostgresql-adapter (50.0)
+      activerecord-jdbc-adapter (~> 50.0)
       jdbc-postgres (>= 9.4, < 43)
-    activestorage (5.2.3)
-      actionpack (= 5.2.3)
-      activerecord (= 5.2.3)
+    activestorage (6.0.0)
+      actionpack (= 6.0.0)
+      activejob (= 6.0.0)
+      activerecord (= 6.0.0)
       marcel (~> 0.3.1)
-    activesupport (5.2.3)
+    activesupport (6.0.0)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    arel (9.0.0)
-    autoprefixer-rails (9.5.1.1)
+      zeitwerk (~> 2.1, >= 2.1.8)
+    autoprefixer-rails (9.6.5)
       execjs
     bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
@@ -63,22 +76,22 @@
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.1.5)
-    crass (1.0.4)
-    erubi (1.8.0)
+    crass (1.0.5)
+    erubi (1.9.0)
     execjs (2.7.0)
     ffi (1.11.1)
     ffi (1.11.1-java)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
-    i18n (1.6.0)
+    i18n (1.7.0)
       concurrent-ruby (~> 1.0)
-    jdbc-postgres (42.1.4)
-    jquery-rails (4.3.3)
+    jdbc-postgres (42.2.6)
+    jquery-rails (4.3.5)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
     jruby-openssl (0.10.2-java)
-    loofah (2.2.3)
+    loofah (2.3.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -87,88 +100,86 @@
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
     mimemagic (0.3.3)
-    mini_mime (1.0.1)
+    mini_mime (1.0.2)
     mini_portile2 (2.4.0)
-    minitest (5.11.3)
-    newrelic_rpm (6.4.0.356)
-    nio4r (2.3.1)
-    nio4r (2.3.1-java)
-    nokogiri (1.10.3)
+    minitest (5.12.2)
+    newrelic_rpm (6.7.0.359)
+    nio4r (2.5.2)
+    nio4r (2.5.2-java)
+    nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.3-java)
+    nokogiri (1.10.4-java)
     pg (1.1.4)
-    puma (3.12.1)
-    puma (3.12.1-java)
+    puma (4.2.1)
+      nio4r (~> 2.0)
+    puma (4.2.1-java)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rails (5.2.3)
-      actioncable (= 5.2.3)
-      actionmailer (= 5.2.3)
-      actionpack (= 5.2.3)
-      actionview (= 5.2.3)
-      activejob (= 5.2.3)
-      activemodel (= 5.2.3)
-      activerecord (= 5.2.3)
-      activestorage (= 5.2.3)
-      activesupport (= 5.2.3)
+    rails (6.0.0)
+      actioncable (= 6.0.0)
+      actionmailbox (= 6.0.0)
+      actionmailer (= 6.0.0)
+      actionpack (= 6.0.0)
+      actiontext (= 6.0.0)
+      actionview (= 6.0.0)
+      activejob (= 6.0.0)
+      activemodel (= 6.0.0)
+      activerecord (= 6.0.0)
+      activestorage (= 6.0.0)
+      activesupport (= 6.0.0)
       bundler (>= 1.3.0)
-      railties (= 5.2.3)
+      railties (= 6.0.0)
       sprockets-rails (>= 2.0.0)
     rails-assets-commonmark (0.29.0)
     rails-assets-highlightjs (9.12.0)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.0.4)
-      loofah (~> 2.2, >= 2.2.2)
-    railties (5.2.3)
-      actionpack (= 5.2.3)
-      activesupport (= 5.2.3)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
+    railties (6.0.0)
+      actionpack (= 6.0.0)
+      activesupport (= 6.0.0)
       method_source
       rake (>= 0.8.7)
-      thor (>= 0.19.0, < 2.0)
-    rake (12.3.2)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.10.0)
-      ffi (~> 1.0)
-    sass (3.7.4)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-    sass-rails (5.0.7)
-      railties (>= 4.0.0, < 6)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
-    sassc (2.0.1)
+      thor (>= 0.20.3, < 2.0)
+    rake (13.0.0)
+    sass-rails (6.0.0)
+      sassc-rails (~> 2.1, >= 2.1.1)
+    sassc (2.2.1)
       ffi (~> 1.9)
-      rake
-    sprockets (3.7.2)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
+    sprockets (4.0.0)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    therubyrhino (2.0.4)
-      therubyrhino_jar (>= 1.7.3)
-    therubyrhino_jar (1.7.6)
+    therubyrhino (2.1.2)
+      therubyrhino_jar (>= 1.7.4, < 1.7.9)
+    therubyrhino_jar (1.7.8)
     thor (0.20.3)
     thread_safe (0.3.6)
     thread_safe (0.3.6-java)
-    tilt (2.0.9)
+    tilt (2.0.10)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (4.1.20)
+    uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
-    websocket-driver (0.7.0)
+    websocket-driver (0.7.1)
       websocket-extensions (>= 0.1.0)
-    websocket-driver (0.7.0-java)
+    websocket-driver (0.7.1-java)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
+    websocket-extensions (0.1.4)
+    zeitwerk (2.2.0)
 
 PLATFORMS
   java
@@ -183,7 +194,7 @@
   newrelic_rpm
   pg
   puma
-  rails (~> 5.2.0)
+  rails (~> 6.0.0)
   rails-assets-commonmark!
   rails-assets-highlightjs!
   sass-rails