Disable wsl linter

The newest golangci-lint added a new linter `wsl`:

   golangci/golangci-lint#771

The linting rules it adds don't seem particularly useful to me.

Signed-off-by: Steven Danna <steve@chef.io>

.golangci.yml

@@ -15,6 +15,7 @@ linters:
     - stylecheck
     - unparam
     - lll
+    - wsl
 
 issues:
   exclude-rules: