Add licensing information to readme

README.md

@@ -5,6 +5,7 @@
 [![Code Climate](https://codeclimate.com/repos/5538989ee30ba0793100090f/badges/e10a2fe18a9256d69e2a/gpa.svg)](https://codeclimate.com/repos/5538989ee30ba0793100090f/feed)
 [![Coverage Status](https://coveralls.io/repos/github/amperser/proselint/badge.svg?branch=master)](https://coveralls.io/github/amperser/proselint?branch=master)
 [![Dependency Status](https://gemnasium.com/amperser/proselint.svg)](https://gemnasium.com/amperser/proselint)
+[![License](https://img.shields.io/badge/License-BSD-blue.svg)](https://en.wikipedia.org/wiki/BSD_licenses)
 
 Writing is notoriously hard, even for the best writers, and it's not for lack of good advice — a tremendous amount of knowledge about the craft is strewn across usage guides, dictionaries, technical manuals, essays, pamphlets, websites, and the hearts and minds of great authors and editors. But poring over Strunk & White hardly makes one a better writer — it turns you into neither Strunk nor White. And nobody has the capacity to apply all the advice from *Garner’s Modern American Usage*, a 975-page usage guide, to everything they write. In fact, the whole notion that one becomes a better writer by reading advice on writing rests on untenable assumptions about learning and memory. The traditional formats of knowledge about writing are thus essentially inert, waiting to be transformed.
 
@@ -175,3 +176,7 @@ You can disable any of the checks by modifying `.proselintrc`.
 ### Contributing
 
 Interested in contributing to `proselint`? Great — there are plenty of ways you can help. Read more on [our website](http://proselint.com/contributing/), where we describe how you can help us build `proselint` into the greatest writing tool in the world.
+
+### License
+
+The project is licensed under the BSD license.