Update yml for env

.circleci/config.yml

@@ -5,9 +5,9 @@ executors:
     docker:
       - image: circleci/golang:1.11
     environment:
-      - GOROOT: "/usr/local/go"
-      - GOPATH: "/go"
-      - PATH: ${GOPATH}/bin:${GOROOT}/bin:${PATH}
+      GOROOT: "/usr/local/go"
+      GOPATH: "/go"
+      PATH: $GOPATH/bin:$GOROOT/bin:$PATH
   go1_12:
     docker:
     - image: circleci/golang:1.12