update sprocket gem to handle vulnerability issues

Author: DanielAmah

Gemfile

@@ -40,7 +40,7 @@ gem "paperclip", "~> 5.1.0"
 gem "aws-sdk"
 gem "redcarpet"
 gem "holidays"
-gem "sprockets-rails", "~> 2.3"
+gem "sprockets-rails", "~>3.0"
 gem "brakeman"
 
 source "https://rails-assets.org" do

Gemfile.lock

@@ -636,7 +636,7 @@ GEM
     concurrent-ruby (1.0.5)
     crack (0.4.2)
       safe_yaml (~> 1.0.0)
-    crass (1.0.3)
+    crass (1.0.4)
     dalli (2.7.0)
     database_cleaner (1.3.0)
     debug_inspector (0.0.2)
@@ -694,7 +694,7 @@ GEM
     highline (1.7.8)
     holidays (1.2.0)
     http_accept_language (2.0.1)
-    i18n (0.9.1)
+    i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     jmespath (1.3.1)
     jquery-atwho-rails (1.3.2)
@@ -711,7 +711,7 @@ GEM
       addressable (~> 2.3)
     letter_opener (1.2.0)
       launchy (~> 2.2)
-    loofah (2.2.1)
+    loofah (2.2.2)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.0)
@@ -724,15 +724,15 @@ GEM
     mimemagic (0.3.2)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
-    minitest (5.10.3)
+    minitest (5.11.3)
     momentjs-rails (2.7.0)
       railties (>= 3.1)
     multi_json (1.11.2)
     neat (1.5.1)
       bourbon (>= 3.1)
       sass (~> 3.2.19)
     newrelic_rpm (3.9.0.229)
-    nokogiri (1.8.2)
+    nokogiri (1.8.4)
       mini_portile2 (~> 2.3.0)
     normalize-rails (3.0.1)
     orm_adapter (0.5.0)
@@ -751,7 +751,7 @@ GEM
       slop (~> 3.4)
     pry-rails (0.3.2)
       pry (>= 0.9.10)
-    rack (1.6.8)
+    rack (1.6.10)
     rack-test (0.6.3)
       rack (>= 1.0)
     rack-timeout (0.0.4)
@@ -769,12 +769,12 @@ GEM
     rails-assets-chartjs (1.0.1)
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.8)
-      activesupport (>= 4.2.0.beta, < 5.0)
+    rails-dom-testing (1.0.9)
+      activesupport (>= 4.2.0, < 5.0)
       nokogiri (~> 1.6)
       rails-deprecated_sanitizer (>= 1.0.1)
-    rails-html-sanitizer (1.0.3)
-      loofah (~> 2.0)
+    rails-html-sanitizer (1.0.4)
+      loofah (~> 2.2, >= 2.2.2)
     rails-observers (0.1.2)
       activemodel (~> 4.0)
     rails_12factor (0.0.2)
@@ -845,13 +845,13 @@ GEM
     spring (1.1.3)
     spring-commands-rspec (1.0.2)
       spring (>= 0.9.1)
-    sprockets (3.7.1)
+    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)
     temple (0.7.6)
     terminal-table (1.5.2)
     thor (0.19.4)
@@ -863,7 +863,7 @@ GEM
       rails (>= 3.1)
     twitter-text (1.9.2)
       unf (~> 0.1.0)
-    tzinfo (1.2.4)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (4.0.2)
       execjs (>= 0.3.0, < 3)
@@ -944,7 +944,7 @@ DEPENDENCIES
   simplecov
   spring
   spring-commands-rspec
-  sprockets-rails (~> 2.3)
+  sprockets-rails (~> 3.0)
   timecop
   title
   twitter-text

config/application.rb

@@ -58,5 +58,6 @@ class Application < Rails::Application
     # config.i18n.default_locale = :de
     config.secret_token = ENV["SECRET_TOKEN"]
     config.active_record.raise_in_transactional_callbacks = true
+    config.assets.precompile << %w(landing.css)
   end
 end