Merge pull request #58 from smola/go-travis

ci: test Go 1.9.x and 1.10.x

Author: mcuadros

.travis.yml

@@ -1,14 +1,11 @@
 language: go
 
 go:
-    - 1.9
+  - 1.9.x
+  - 1.10.x
 
 go_import_path: gopkg.in/src-d/go-billy.v4
 
-matrix:
-    allow_failures:
-        - go: tip
-
 install:
   - go get -v -t ./...