update versionist to 2.0.1

Gemfile

@@ -210,7 +210,7 @@ gem "rubyzip", "1.3.0", require: "zip"
 # https://github.com/discourse/discourse/pull/238
 gem "minitest"
 
-gem "versionist", "2.0.0"
+gem "versionist", "2.0.1"
 
 # Windows and OSX have an execjs compatible runtime built-in, Linux users should
 # install Node.js or use "therubyracer".

Gemfile.lock

@@ -763,10 +763,10 @@ GEM
     validate_url (1.0.8)
       activemodel (>= 3.0.0)
       public_suffix
-    versionist (2.0.0)
+    versionist (2.0.1)
       activesupport (>= 3)
       railties (>= 3)
-      yard (~> 0.9.11)
+      yard (~> 0.9.20)
     warden (1.2.8)
       rack (>= 2.0.6)
     webfinger (1.1.0)
@@ -927,7 +927,7 @@ DEPENDENCIES
   unicorn (= 5.5.3)
   unicorn-worker-killer (= 0.4.4)
   uuid (= 2.3.9)
-  versionist (= 2.0.0)
+  versionist (= 2.0.1)
   webmock (= 3.8.3)
   will_paginate (= 3.1.7)