[ci] white list vagrantup.com, 3v4l.org, voicesoftheelephpant.com (#769)

.travis.yml

 before_script:
   - gem install awesome_bot
 script:
-  - awesome_bot README.md --white-list igor.io,symfony,toranproxy.com
+  - awesome_bot README.md --white-list igor.io,symfony,toranproxy.com,vagrantup.com,3v4l.org,voicesoftheelephpant.com
 notifications:
   email: false