Use Ruby 2.6, update a bunch of gems

.ruby-version

@@ -1 +1 @@
-2.3.8
+2.6.2

Gemfile

@@ -19,14 +19,14 @@ gem 'sdoc', '~> 0.4.1', group: :doc
 gem 'bcrypt', '~> 3.1.7'
 
 gem 'haml'
-gem 'bootstrap-sass', '~> 3.2.0.1'
+gem 'bootstrap-sass', '~> 3.4.0'
 gem 'bootswatch-rails'
 gem 'sweetalert-rails'
 gem 'will_paginate'
 gem 'will_paginate-bootstrap'
-gem 'devise'
+gem 'devise', '~> 4.0'
 gem 'devise-i18n'
-gem 'devise-async'
+gem 'devise-async' # TODO: bring this to 1.0 after rails5 upgrade
 gem 'bootstrap_form'
 gem 'font-kit-rails'
 gem 'nprogress-rails'

Gemfile.lock

@@ -48,15 +48,18 @@ GEM
     airbrussh (1.1.2)
       sshkit (>= 1.6.1, != 1.7.0)
     arel (6.0.4)
-    bcrypt (3.1.11)
+    autoprefixer-rails (9.5.0)
+      execjs
+    bcrypt (3.1.12)
     better_errors (2.1.1)
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
       rack (>= 0.9.0)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    bootstrap-sass (3.2.0.2)
+    bootstrap-sass (3.4.1)
-      sass (~> 3.2)
+      autoprefixer-rails (>= 5.2.1)
+      sassc (>= 2.0.0)
     bootstrap3-datetimepicker-rails (4.7.14)
       momentjs-rails (>= 2.8.1)
     bootstrap_form (2.6.0)
@@ -99,22 +102,21 @@ GEM
     colorize (0.8.1)
     concurrent-ruby (1.0.5)
     connection_pool (2.2.1)
-    crass (1.0.2)
+    crass (1.0.4)
     daemons (1.2.4)
     database_cleaner (1.5.3)
     debug_inspector (0.0.2)
     delayed_paperclip (3.0.1)
       activejob (>= 4.2)
       paperclip (>= 3.3)
-    devise (3.5.10)
+    devise (4.6.2)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
-      railties (>= 3.2.6, < 5)
+      railties (>= 4.1.0, < 6.0)
       responders
-      thread_safe (~> 0.1)
       warden (~> 1.2.3)
-    devise-async (0.10.2)
+    devise-async (0.7.0)
-      devise (>= 3.2, < 4.0)
+      devise (>= 2.2)
     devise-i18n (1.1.2)
     diff-lcs (1.3)
     docile (1.1.5)
@@ -314,7 +316,8 @@ GEM
     http_parser.rb (0.6.0)
     httparty (0.14.0)
       multi_xml (>= 0.5.2)
-    i18n (0.8.1)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     i18n-js (3.0.0.rc10)
       i18n (~> 0.6)
     inflecto (0.0.2)
@@ -374,7 +377,7 @@ GEM
       net-ssh (>= 2.6.5)
     net-ssh (4.1.0)
     newrelic_rpm (4.2.0.334)
-    nokogiri (1.10.1)
+    nokogiri (1.10.2)
       mini_portile2 (~> 2.4.0)
     nokogumbo (2.0.1)
       nokogiri (~> 1.8, >= 1.8.4)
@@ -438,8 +441,8 @@ GEM
     rails-assets-jquery (2.2.4)
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.8)
+    rails-dom-testing (1.0.9)
-      activesupport (>= 4.2.0.beta, < 5.0)
+      activesupport (>= 4.2.0, < 5.0)
       nokogiri (~> 1.6)
       rails-deprecated_sanitizer (>= 1.0.1)
     rails-html-sanitizer (1.0.4)
@@ -466,7 +469,7 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     raindrops (0.18.0)
-    rake (12.0.0)
+    rake (12.3.2)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.8)
       ffi (>= 0.5.0)
@@ -513,6 +516,9 @@ GEM
       sass (~> 3.2.2)
       sprockets (~> 2.8, < 3.0)
       sprockets-rails (~> 2.0)
+    sassc (2.0.1)
+      ffi (~> 1.9)
+      rake
     sdoc (0.4.2)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
@@ -617,7 +623,7 @@ PLATFORMS
 DEPENDENCIES
   bcrypt (~> 3.1.7)
   better_errors
-  bootstrap-sass (~> 3.2.0.1)
+  bootstrap-sass (~> 3.4.0)
   bootstrap3-datetimepicker-rails (~> 4.7.14)
   bootstrap_form
   bootswatch-rails
@@ -630,7 +636,7 @@ DEPENDENCIES
   colorize
   database_cleaner
   delayed_paperclip
-  devise
+  devise (~> 4.0)
   devise-async
   devise-i18n
   factory_girl_rails