Merge pull request #136 from punchcard-cms/greenkeeper-nunjucks-3.0.0

Update nunjucks to version 3.0.0 🚀

Author: scottnath

package.json

@@ -38,7 +38,7 @@
     "js-yaml": "^3.5.3",
     "lodash": "^4.14.1",
     "node-dir": "^0.1.11",
-    "nunjucks": "^2.4.0",
+    "nunjucks": "^3.0.0",
     "plugabilly": "^0.1.0",
     "uuid": "^3.0.1"
   },