Bump sprockets-rails from 2.3.3 to 3.2.1

Bumps [sprockets-rails](https://github.com/rails/sprockets-rails) from 2.3.3 to 3.2.1.
- [Release notes](https://github.com/rails/sprockets-rails/releases)
- [Changelog](https://github.com/rails/sprockets-rails/blob/v3.2.1/CHANGELOG.md)
- [Commits](rails/sprockets-rails@v2.3.3...v3.2.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -5,7 +5,7 @@ source 'https://rubygems.org'
 gem 'rails', '~> 4.2'
 gem 'sqlite3'
 # angular-rails-templates currently only works with sprocket-rails 2
-gem 'sprockets-rails', '~> 2.3.3'
+gem 'sprockets-rails', '~> 3.2.1'
 
 gem 'angular-rails-templates'
 gem 'angular_rails_csrf'

Gemfile.lock

@@ -67,7 +67,7 @@ GEM
     chromedriver-helper (1.2.0)
       archive-zip (~> 0.10)
       nokogiri (~> 1.8)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.4)
     config-parser (0.3.0)
     coveralls (0.8.22)
       json (>= 1.8, < 3)
@@ -93,16 +93,16 @@ GEM
     io-like (0.3.0)
     json (2.1.0)
     kgio (2.11.2)
-    loofah (2.2.2)
+    loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.0)
       mini_mime (>= 0.1.1)
     mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minitest (5.11.3)
-    nokogiri (1.8.2)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.1)
+      mini_portile2 (~> 2.4.0)
     parallel (1.12.1)
     parser (2.5.1.0)
       ast (~> 2.4.0)
@@ -113,7 +113,7 @@ GEM
     public_suffix (3.0.2)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.10)
+    rack (1.6.11)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.10)
@@ -188,10 +188,10 @@ GEM
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (2.3.3)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      sprockets (>= 2.8, < 4.0)
+    sprockets-rails (3.2.1)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
     sqlite3 (1.3.13)
     temple (0.8.0)
     term-ansicolor (1.6.0)
@@ -238,7 +238,7 @@ DEPENDENCIES
   rubocop
   simplecov
   simplecov-console
-  sprockets-rails (~> 2.3.3)
+  sprockets-rails (~> 3.2.1)
   sqlite3
   uglifier (>= 1.3.0)
   unicorn-rails