auto_link() learned to recognize more URLs

Problem:
auto_link() only works on URLs that are preceded by a new line, space, or open parentheses. As a result the URL in the string below would be missed.

'Google<br />http://www.google.com/'

Solution:
Add a word boundary to the list of features that can precede a URL.

Credit to: @scaryuncledevin, issue #419
1 file changed