chore(package): update testdouble to version 3.2.1

Closes #857

Author: greenkeeper[bot]

package.json

@@ -85,7 +85,7 @@
     "stylelint-order": "^0.5.0",
     "stylelint-scss": "^1.4.1",
     "stylelint-selector-bem-pattern": "^1.0.0",
-    "testdouble": "3.0.0",
+    "testdouble": "3.2.1",
     "to-slug-case": "^1.0.0",
     "query-ast": "^1.0.1",
     "validate-commit-msg": "^2.6.1",