Update README.md

Fix error
Merge pull request #93 from cris/patch-1

Fix error - exception should be instantiated
Syntax: Access private var with @#'

Note that this rule is extrated from the community Library Coding
Standards, which is already referenced at the top of this document:

http://dev.clojure.org/display/community/Library+Coding+Standards
Merge pull request #94 from into-clojure/master

Syntax: Access private var with @#'
Add a rule about the indentation of multi-arity functions
Merge pull request #95 from wjlroe/indentation-of-multiple-arity-forms

Style: indentation of multiple-arity functions