upgrade go version from 1.9.2 to 1.9.7 in test env.

paco0x · paco0x · commit feb0e67fd732 · 2018-07-23T15:58:12.000+08:00
upgrade to avoid bug: golang/go#22976 Signed-off-by: Penghui Liao <liaoishere@gmail.com>
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - "1.9.2"
+  - "1.9.7"
   - "1.10.3"
 services:
   - redis-server
