Fix golang version

circle.yml

 machine:
-  go:
-    version: 1.9.0
   services:
     - docker
     - memcached
     - redis
     - rabbitmq-server
+  post:
+    - sudo rm -rf /usr/local/go
+    - wget https://storage.googleapis.com/golang/go1.9.linux-amd64.tar.gz
+    - sudo tar -C /usr/local -xzf go1.9.linux-amd64.tar.gz
+    - go version
 
 dependencies:
   override: