Bump Go versions and use '.x' to always get latest minor versions

License: MIT
Signed-off-by: Harald Nordgren <haraldnordgren@gmail.com>

.travis.yml

@@ -10,7 +10,7 @@ os:
 language: go
 
 go:
-    - 1.11
+    - 1.11.x
 
 env:
   - TEST_NO_FUSE=1 TEST_VERBOSE=1 TEST_SUITE=test_go_expensive