Use the new fork gem

Gemfile

@@ -19,13 +19,13 @@ gem 'uglifier', '>=1.3.0'
 gem 'aasm', '~> 5.2.0'
 gem 'acts_as_list'
 gem 'bcrypt', '~> 3.1.16'
-gem 'chartjs-ror', :git => 'git://github.com/ZeiP/chartjs-ror.git'
 gem 'htmlentities'
 gem 'paperclip'
 gem 'puma', '~> 5.4'
 gem 'rails_autolink'
 gem 'RedCloth'
 gem 'sanitize', '~> 6.0'
+gem 'tracks-chartjs-ror'
 gem 'will_paginate'
 
 # See https://github.com/sstephenson/execjs#readme for more supported runtimes

Gemfile.lock

@@ -1,10 +1,3 @@
-GIT
-  remote: git://github.com/ZeiP/chartjs-ror.git
-  revision: e9d3aabbda3059c001144833d915a386d8b511c5
-  specs:
-    chartjs-ror (3.6.4)
-      rails (>= 3.1)
-
 GEM
   remote: https://rubygems.org/
   specs:
@@ -305,6 +298,8 @@ GEM
       rails (>= 5.0)
       safe_yaml (>= 0.8.6)
       sassc
+    tracks-chartjs-ror (3.6.4)
+      rails (>= 3.1)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
     uglifier (4.2.0)
@@ -331,7 +326,6 @@ DEPENDENCIES
   bootstrap-sass (= 3.4.1)
   bullet
   byebug
-  chartjs-ror!
   codeclimate-test-reporter (= 1.0.7)
   coffee-rails (~> 5.0.0)
   database_cleaner
@@ -363,9 +357,10 @@ DEPENDENCIES
   sqlite3
   therubyracer
   tolk (~> 4.1.0)
+  tracks-chartjs-ror
   uglifier (>= 1.3.0)
   will_paginate
   yard
 
 BUNDLED WITH
-   2.1.4
+   2.2.22