Update history to reflect merge of #57 [ci skip]

Author: jekyllbot

History.markdown

@@ -1,5 +1,9 @@
 ## HEAD
 
+### Development Fixes
+
+  * Test against Ruby 2.5 (#57)
+
 ## 1.5.0 / 2017-12-03
 
 ### Documentation
@@ -15,7 +19,6 @@
   * Inherit Jekyll's rubocop config for consistency (#48)
   * define path with __dir__ (#47)
 
-
 ## 1.4.1 / 2017-06-21
 
   * Don't ask .empty? until it's a String. (#38)