Drop the 'draft' weasel-word

It's been followed for years in number of projects (granted, all being
exclusively written by author of this style), so calling it "draft"
seems just weasely.

notes/style.md

@@ -1,4 +1,4 @@
-Coding style - draft
+Coding style
 ============
 
 This is the official coding style for Shellfu project.