Update version_gem to version 1.1.6

Author: depfu[bot]

Gemfile.lock

@@ -128,7 +128,7 @@ GEM
       unicode-display_width (>= 1.1.1, < 3)
     unicode-display_width (2.6.0)
     uri (0.13.1)
-    version_gem (1.1.4)
+    version_gem (1.1.6)
     webrick (1.9.1)
     yard (0.9.37)
     yard-junk (0.0.10)