Ignore Dot Directories in ~/terminus/plugins

[derimagia]

Expected behavior

Dot files found in this directory are not actually plugins and I can't think of a case that they should be loaded. They probably should not even be looked at or warned about. If there is a chance they will be used for plugins, maybe just not warn about the directories if they aren't valid plugins?

Actual behavior

Having a IntelliJ metadata folder throws a warning:
[warning] Plugin Discovery: Ignoring directory /Users/X/.terminus/plugins/.idea because: The file "/Users/X/.terminus/plugins/.idea/composer.json" is does not exist.

Steps to reproduce the behavior

Add some dot-folder to ~/.terminus/plugins and notice the warning.

Using Terminus 1.0