Bump versionist

Gemfile

@@ -209,7 +209,7 @@ gem "rubyzip", "1.2.1", require: "zip"
 # https://github.com/discourse/discourse/pull/238
 gem "minitest"
 
-gem "versionist", "1.6.0"
+gem "versionist", "1.7.0"
 
 # Windows and OSX have an execjs compatible runtime built-in, Linux users should
 # install Node.js or use "therubyracer".

Gemfile.lock

@@ -739,10 +739,10 @@ GEM
     validate_url (1.0.2)
       activemodel (>= 3.0.0)
       addressable
-    versionist (1.6.0)
+    versionist (1.7.0)
       activesupport (>= 3)
       railties (>= 3)
-      yard (~> 0.7)
+      yard (~> 0.9.11)
     warden (1.2.7)
       rack (>= 1.0)
     webfinger (1.1.0)
@@ -902,7 +902,7 @@ DEPENDENCIES
   unicorn (= 5.4.0)
   unicorn-worker-killer (= 0.4.4)
   uuid (= 2.3.8)
-  versionist (= 1.6.0)
+  versionist (= 1.7.0)
   webmock (= 3.0.1)
   will_paginate (= 3.1.6)