Update v0.11.4 to v0.11.5

Author: hiroyuki-sato

_config.yml

@@ -4,7 +4,7 @@
 # You can create any custom variable you would like, and they will be accessible
 # in the templates via {{ site.myvariable }}.
 title: Embulk
-embulk_version: 0.11.4
+embulk_version: 0.11.5
 # email: your-email@example.com
 # description: >- # this means to ignore newlines until "baseurl:"
 #   Write an awesome description for your new site here. You can edit this