Update nokogiri due to security vulnerability
@@ -179,7 +179,7 @@ GEM
minitest (5.10.3)
multipart-post (2.0.0)
net-dns (0.8.0)
- nokogiri (1.8.0)
+ nokogiri (1.8.1)
mini_portile2 (~> 2.2.0)
octokit (4.7.0)
sawyer (~> 0.8.0, >= 0.5.3)
