ensure octokit is always 4.7 or greater

Gemfile

@@ -1,3 +1,3 @@
 source 'https://rubygems.org'
 
-gem 'octokit'
+gem 'octokit', '~> 4.7'

Gemfile.lock

@@ -1,21 +1,23 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.3.8)
-    faraday (0.9.2)
+    addressable (2.5.1)
+      public_suffix (~> 2.0, >= 2.0.2)
+    faraday (0.12.2)
       multipart-post (>= 1.2, < 3)
     multipart-post (2.0.0)
-    octokit (4.2.0)
-      sawyer (~> 0.6.0, >= 0.5.3)
-    sawyer (0.6.0)
-      addressable (~> 2.3.5)
-      faraday (~> 0.8, < 0.10)
+    octokit (4.7.0)
+      sawyer (~> 0.8.0, >= 0.5.3)
+    public_suffix (2.0.5)
+    sawyer (0.8.1)
+      addressable (>= 2.3.5, < 2.6)
+      faraday (~> 0.8, < 1.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  octokit
+  octokit (~> 4.7)
 
 BUNDLED WITH
-   1.11.2
+   1.12.0