doc: adding patreon badge

README.md

@@ -1,6 +1,6 @@
 # DocToc [![build status](https://secure.travis-ci.org/thlorenz/doctoc.svg)](http://travis-ci.org/thlorenz/doctoc)
 
-[![NPM](https://nodei.co/npm/doctoc.png?downloads=true&stars=true)](https://nodei.co/npm/doctoc/)
+<a href="https://www.patreon.com/bePatron?u=8663953"><img alt="become a patron" src="https://c5.patreon.com/external/logo/become_a_patron_button.png" height="35px"></a>
 
 Generates table of contents for markdown files inside local git repository. Links are compatible with anchors generated
 by github or other sites via a command line flag.