update travis file

.travis.yml

@@ -7,7 +7,7 @@ language: go
 
 go:
   - "1.8"
-  - "tip"
+  - "1.9"
 
 services:
   - docker
@@ -26,8 +26,8 @@ addons:
     - mongodb-org-shell
 
 before_install:
-  - docker pull microsoft/mssql-server-linux:ctp1-4
-  - docker run -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=my$Password' --name mssql -p 1433:1433 -d microsoft/mssql-server-linux:ctp1-4
+  - docker pull microsoft/mssql-server-linux:ctp2-1
+  - docker run -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=my$Password' --name mssql -p 1433:1433 -d microsoft/mssql-server-linux:ctp2-1
   - docker ps -a
 
 env: