Updates README file to add description about tslintAutoFix flag

Author: ajainarayanan

README.md

@@ -63,6 +63,9 @@ Path to *tsconfig.json* file. Default: `path.resolve(compiler.options.context, '
 * **tslint** `string | true`: 
 Path to *tslint.json* file or `true`. If `true`, uses `path.resolve(compiler.options.context, './tslint.json')`. Default: `undefined`.
 
+* **tslintAutoFix** `boolean`:
+Passes on `--fix` flag while running `tslint` to auto fix linting errors.
+
 * **watch** `string | string[]`: 
 Directories or files to watch by service. Not necessary but improves performance (reduces number of `fs.stat` calls).