Simplify dep install

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index da5d6ae..2d8c086 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,4 @@
   - 1.4
   - tip
 install:
-  - go get github.com/stretchr/testify
-  - go get github.com/stvp/go-udp-testing
-  - go get github.com/tobi/airbrake-go
-  - go get github.com/getsentry/raven-go
+  - go get -t ./...