Fix Travis builds

Author: moul

.travis.yml

@@ -22,7 +22,7 @@ before_install:
   - go get -u github.com/axw/gocov/gocov
   - go get -u github.com/mattn/goveralls
   - go get golang.org/x/tools/cmd/cover
-  - go get github.com/moul/anonuuid/cmd/anonuuid
+  - GO15VENDOREXPERIMENT=1 go get github.com/moul/anonuuid/cmd/anonuuid
 
 
 script: