Bypass "bandwidth limit exceeded" errors when cloning from googlesource

cf. golang/go#12933

.travis.yml

@@ -5,9 +5,17 @@ go:
   - tip
 
 env:
-- CGO_ENABLED=0
+  - CGO_ENABLED=0
+
+before_install:
+  # Decrypts a script that installs an authenticated cookie
+  # for git to use when cloning from googlesource.com.
+  # Bypasses "bandwidth limit exceeded" errors.
+  # See github.com/golang/go/issues/12933
+  - openssl aes-256-cbc -K $encrypted_3df18f9af81d_key -iv $encrypted_3df18f9af81d_iv -in dist/gitcookie.sh.enc -out dist/gitcookie.sh -d
 
 install:
+  - bash dist/gitcookie.sh
   - go get -t ./...
   - go get golang.org/x/tools/cmd/vet
 

dist/gitcookie.sh.enc

+(#劕-
Dr}`:,0@9pK8ZˎVm0^B%լ@9]lП)8"Z_͑:g7v]7#`޸'޾ޅǦB9z^'5\*N
+k~=w^$-Df(*Cd/uk
_vM
U+LgJ#[]
+.wQ/٫B\BJi'"v{y)x\8'2렋ta}<G7Gb I0o~R)O
\ No newline at end of file