Bump go versions in travis

Failures might be caused by inotify not working correctly in travis.
This is probably because travis has things mounted over NFS.
https://github.com/travis-ci/travis-ci/issues/2342

test/shell/t3.sh

@@ -1,7 +1,9 @@
 #!/bin/bash -e
 
 if env | grep -q -e '^TRAVIS=true$'; then
-	exit 0	# XXX: this test only fails on travis! why?
+	# inotify doesn't seem to work properly on travis
+	echo "Travis and Jenkins give wonky results here, skipping test!"
+	exit
 fi
 
 . etcd.sh	# start etcd as job # 1