Change the .ycm_extra_conf.py license.

I sent an email to the original author of the upstream file and he 
clarified that the file is not intended to be GPLv3 but rather public
domain:
https://github.com/Valloric/YouCompleteMe/commit/cb7ee5e3c151d9d95f100cb568fa4afbab39effc

* .ycm_extra_conf.py: Change the license to match the upstream change.



git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1476435 13f79535-47bb-0310-9956-ffa450edef68