[ruby/webrick] Bump version to 1.6.0

https://github.com/ruby/webrick/commit/c5635fa5e2
2019-11-30 17:39:58 +09:00 · 2019-11-30 17:39:58 +09:00 · edfbffb241
--- a/lib/webrick/version.rb
+++ b/lib/webrick/version.rb
@ -14,5 +14,5 @@ module WEBrick
  ##
  # The WEBrick version

-  VERSION      = "1.5.0"
+  VERSION      = "1.6.0"
 end