add to circle ci

Signed-off-by: Riyaz Faizullabhoy <riyaz.faizullabhoy@docker.com>

circle.yml

@@ -37,10 +37,11 @@ dependencies:
         pwd: $BASE_STABLE
 
   post:
-  # For the stable go version, additionally install linting tools
+  # For the stable go version, additionally install linting and misspell tools
     - >
       gvm use stable &&
-      go get github.com/golang/lint/golint
+      go get github.com/golang/lint/golint &&
+      go get -u github.com/client9/misspell/cmd/misspell
 test:
   pre:
   # Output the go versions we are going to test
@@ -62,6 +63,10 @@ test:
     - gvm use stable && make lint:
         pwd: $BASE_STABLE
 
+  # MISSPELL
+    - gvm use stable && make misspell:
+        pwd: $BASE_STABLE
+
   override:
   # Test stable, and report
   # hacking this to be parallel