travis: force install extension deps.
travis: force install extension deps.

umaar/lighthouse,deepanjanroy/lighthouse,GoogleChrome/lighthouse,arturmiz/lighthouse,cedricbellet/lighthouse,cedricbellet/lighthouse,arturmiz/lighthouse,umaar/lighthouse,ev1stensberg/lighthouse,cedricbellet/lighthouse,wardpeet/lighthouse,arturmiz/lighthouse,wardpeet/lighthouse,ev1stensberg/lighthouse,mixed/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,deepanjanroy/lighthouse,tkadlec/lighthouse,cedricbellet/lighthouse,umaar/lighthouse,umaar/lighthouse,wardpeet/lighthouse,GoogleChrome/lighthouse,deepanjanroy/lighthouse,mixed/lighthouse,arturmiz/lighthouse,tommycli/lighthouse,wardpeet/lighthouse,tkadlec/lighthouse,GoogleChrome/lighthouse,mixed/lighthouse,tommycli/lighthouse,deepanjanroy/lighthouse,mixed/lighthouse,tommycli/lighthouse,tommycli/lighthouse,GoogleChrome/lighthouse,cedricbellet/lighthouse,tkadlec/lighthouse,tommycli/lighthouse,tkadlec/lighthouse,ev1stensberg/lighthouse,GoogleChrome/lighthouse,ev1stensberg/lighthouse,arturmiz/lighthouse