Disable SSL Cert Verification + Ignore LinkedIn URLs
Disable SSL Cert Verification + Ignore LinkedIn URLs

- Disabling SSL Cert Verification as local testing passes; however with
Travis, it fails due to potential issue with their _CA Cert Bundle_
(https://github.com/typhoeus/typhoeus#ssl)
- It appears LinkedIn is blocking access from Travis and throwing the
`999 Request Denied` Error
(https://github.com/gjtorikian/html-proofer/issues/215) so ignoring
LinkedIn URLs

DesignOpen/designopen.github.io,DesignOpen/designopen.github.io,DesignOpen/designopen.github.io