Update link to Indent Specification (#375)

Update link to indent specification in readme

Author: KevinGreene

README.md

@@ -194,7 +194,7 @@ indent specifications. Here are a few examples:
 
 These follow the same rules as the `:style/indent` metadata specified by [cider-nrepl][].
 For instructions on how to write these specifications, see
-[this document](https://github.com/clojure-emacs/cider/blob/master/doc/Indent-Spec.md#indent-specification).
+[this document](http://cider.readthedocs.org/en/latest/indent_spec/).
 The only difference is that you're allowed to use lists instead of vectors.
 
 ### Vertical alignment