Add debugging for GOPATH.

Author: meisterT

.travis.yml

@@ -10,6 +10,7 @@ addons:
       - g++-7
 before_install:
   - go get -v github.com/bazelbuild/bazelisk
+  - go env GOPATH
   - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-7 90
   - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 90
 script: