Update diff-lcs to version 1.4.4

Author: mjankowski

Gemfile.lock

@@ -43,7 +43,7 @@ GEM
     coderay (1.1.3)
     concurrent-ruby (1.1.6)
     crass (1.0.6)
-    diff-lcs (1.4.3)
+    diff-lcs (1.4.4)
     erubi (1.9.0)
     i18n (1.8.3)
       concurrent-ruby (~> 1.0)