Use quotes so 1.10 is interpreted correctly

jackpal · web-flow · commit 227668e840fa · 2018-08-13T10:39:44.000-07:00
Without quotes it's parsed as "1.1".
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - 1.10
+  - "1.10"
   - tip
 
 allowed_failures:
