try fix builds travis

Author: CMogilko

.travis.yml

@@ -11,6 +11,7 @@ cache: apt
 go_import_path: gopkg.in/gorethink/gorethink.v3
 
 before_script:
+  - go get -t ./...
   - source /etc/lsb-release && echo "deb http://download.rethinkdb.com/apt $DISTRIB_CODENAME main" | sudo tee /etc/apt/sources.list.d/rethinkdb.list
   - wget -qO- http://download.rethinkdb.com/apt/pubkey.gpg | sudo apt-key add -
   - sudo apt-get update