Update .travis.yml
diff --git a/.travis.yml b/.travis.yml
index 014b958..fb5b5dc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,4 +4,5 @@
   - tip
 
 script:
+  - go get ./...
   - go test github.com/yosuke-furukawa/gojson5/encoding/json5