[WIP] Remove unnecessary `log` directive.
Remove unnecessary `log` directive.

```
--- a/site-cookbooks/webapp/recipes/prerequisites.rb
+++ b/site-cookbooks/webapp/recipes/prerequisites.rb
@@ -33,8 +33,3 @@ ruby_setup "webapp" do

   version node['webapp']['ruby']
 end
-
-log "message" do
-  message "You should manually install Ruby as a `webapp` user. "
-  level :warn
-end
```
Merge pull request #128 from kazu634/webapp-ruby-install

Remove unnecessary `log` directive.