add rubocop and rspec to Gemfile

Gemfile

@@ -1,4 +1,11 @@
 source 'https://rubygems.org'
+
+gem 'rake'
+
 gem 'github_api'
 gem 'colorize'
-gem 'rake'
+
+group :test do
+    gem 'rspec'
+    gem 'rubocop'
+end

Gemfile.lock

@@ -2,9 +2,13 @@ GEM
   remote: https://rubygems.org/
   specs:
     addressable (2.3.6)
+    ast (2.0.0)
+    astrolabe (1.3.0)
+      parser (>= 2.2.0.pre.3, < 3.0)
     colorize (0.7.4)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
+    diff-lcs (1.2.5)
     faraday (0.9.0)
       multipart-post (>= 1.2, < 3)
     github_api (0.12.2)
@@ -29,8 +33,32 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (~> 1.2)
+    parser (2.2.0.3)
+      ast (>= 1.1, < 3.0)
+    powerpack (0.1.0)
     rack (1.5.2)
+    rainbow (2.0.0)
     rake (10.4.2)
+    rspec (3.2.0)
+      rspec-core (~> 3.2.0)
+      rspec-expectations (~> 3.2.0)
+      rspec-mocks (~> 3.2.0)
+    rspec-core (3.2.2)
+      rspec-support (~> 3.2.0)
+    rspec-expectations (3.2.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.2.0)
+    rspec-mocks (3.2.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.2.0)
+    rspec-support (3.2.2)
+    rubocop (0.29.1)
+      astrolabe (~> 1.3)
+      parser (>= 2.2.0.1, < 3.0)
+      powerpack (~> 0.1)
+      rainbow (>= 1.99.1, < 3.0)
+      ruby-progressbar (~> 1.4)
+    ruby-progressbar (1.7.5)
     thread_safe (0.3.4)
 
 PLATFORMS
@@ -40,3 +68,5 @@ DEPENDENCIES
   colorize
   github_api
   rake
+  rspec
+  rubocop