travis: hack for GOROOT + Go 1.9

Francisco Souza · Francisco Souza · commit 1225960e499e · 2017-08-24T21:16:48.000-04:00
It looks like some gometalinter dependency can't find the GOROOT.
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,7 @@
 language: go
-install: make testdeps
+install:
+  - export GOROOT=$(go env GOROOT)
+  - make testdeps
 script: make coverage
 after_success: bash <(curl -s https://codecov.io/bash)
 go:
