Fix small grammatical typos in README

Use a comma instead of a semicolon, similar instead of similar, and its instead of it's.
Proper capitalization of "GitHub"

"Github" -> "GitHub", "github" -> "GitHub"
Format README nicer

Use an h1 instead of just a paragraph for the plugin’s title.
Fix typo in README

"wether" -> "whether"
Merge remote-tracking branch 'lchski/master'

Conflicts:
	README.md