Test with MongoDB 3.6, drop Go 1.8.

AlekSi · AlekSi · commit a65811a6be9b · 2018-01-04T14:41:05.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,6 @@ sudo: required
 language: go
 
 go:
-  - 1.8.x
   - 1.9.x
   - master
 
@@ -13,6 +12,7 @@ matrix:
 
 env:
   - MONGODB_IMAGE=mongo:3.4
+  - MONGODB_IMAGE=mongo:3.6
   - MONGODB_IMAGE=percona/percona-server-mongodb:3.4
 
 services:
