Remove (annoying) deprecation warning and documentation

Author: execjosh

README.md

@@ -6,8 +6,6 @@ _Note:_ A subset of this functionality is now available directly in Atom--see [C
 
 ## Extension Matchers
 
-_NOTE:_ DEPRECATED! Prefer using RegExp Matchers instead.
-
 To map a filetype to a new language, use the `file-types` option. Specify the extension (without a dot) as a key, and the new default extension as the value.
 
 For example, the `.hbs` extension defaults to the `handlebars` grammer. To change it to default to `html-htmlbars` (installed separately), open your `config.cson` (via the `Atom -> Config...` menu) and add the following rule:
@@ -18,7 +16,7 @@ For example, the `.hbs` extension defaults to the `handlebars` grammer. To chang
  "hbs": "text.html.htmlbars"
 ```
 
-An extension matcher will be converted into a RegExp matcher, due to deprecation. The example above is equivalent to the following:
+An extension matcher will be converted into a RegExp matcher. The example above is equivalent to the following:
 
 ```coffee
 "*":

lib/matcher.coffee

@@ -19,18 +19,7 @@ class Matcher
  else if /(^\^)|([.|])|(\$$)/.test matcher
  @_regexp = new RegExp "(#{matcher})", regexpOpts
  else
- # Otherwise, we assume it is an extension matcher, which is now deprecated
- atom.notifications.addWarning '[file-types] Deprecated Config',
- dismissable: true
- detail: """
- Use explicit regular expressions!
-
- Deprecated:
- "#{matcher}": "#{scopeName}"
-
- Preferred:
- "\\\\.#{matcher}$": "#{scopeName}"
- """
+ # Otherwise, we assume it is an extension matcher
  @_regexp = new RegExp "(\\.#{escapeRegExp(matcher)}$)", regexpOpts
 
  match: (string) ->