updates travis to validate with go fmt

.travis.yml

@@ -8,9 +8,12 @@ go:
   - 1.6.x
   - 1.7.x
   - 1.8.x
-  - tip
+  # - tip # sadly fails most of thw times
 
-script: go test -race -coverprofile=coverage.txt -covermode=atomic
+script:
+  - go vet
+  - test -z "$(go fmt ./...)" # fail if not formatted properly
+  - go test -race -coverprofile=coverage.txt -covermode=atomic
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)

sqlmock_test.go

@@ -354,7 +354,6 @@ func TestPreparedQueryExecutions(t *testing.T) {
 	}
 }
 
-
 func TestUnorderedPreparedQueryExecutions(t *testing.T) {
 	t.Parallel()
 	db, mock, err := New()