Add Go 1.10 and 1.11 to Travis

Change-Id: Ic99795cb521e8e9c1124b05628fec41c176ded25
GitHub-Last-Rev: c297132ab1723a19cbe2fa296bde03dd55144fe8
GitHub-Pull-Request: golang/lint#420
Reviewed-on: https://go-review.googlesource.com/c/143546
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/.travis.yml b/.travis.yml
index 4bf492a..b3fdca9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,10 @@
 sudo: false
 language: go
 go:
-  - 1.7.x
   - 1.8.x
   - 1.9.x
+  - 1.10.x
+  - 1.11.x
   - master
 
 go_import_path: golang.org/x/lint