Update .travis.yml

missing dependency

Author: dericofilho

.travis.yml

@@ -5,3 +5,4 @@ install:
   - export PATH=$PATH:$HOME/gopath/bin
   - go get -v code.google.com/p/go.tools/cmd/cover
   - go get -t github.com/smartystreets/goconvey
+  - go get github.com/jacobsa/oglematchers