travisci: automatically upload library documentation
travisci: automatically upload library documentation

Upload to github.io pages at:
  http://kontron.github.io/robotframework-snmplibrary/SnmpLibrary.html

Signed-off-by: Michael Walle <80e54fab1167aac9a5a5dfc5e0e0a3e5102ca3bd@kontron.com>

kontron/robotframework-snmplibrary