update go version for circle-ci (osquery#64)

Author: groob

.circleci/config.yml

@@ -1,8 +1,8 @@
 version: 2
 jobs:
-  build-go1.8:
+  build-go-latest:
     docker:
-        - image: golang:1.8
+        - image: golang:1.10
     working_directory: /go/src/github.com/kolide/osquery-go
     steps: &steps
       - checkout
@@ -39,6 +39,6 @@ workflows:
   version: 2
   build:
     jobs:
-      - build-go1.8
+      - build-go-latest
       - build-go1.9