Be forward compatible with unexpected v9

Author: sunesimonsen

package.json

@@ -32,7 +32,7 @@
     "metalsmith-relative": "1.0.3",
     "metalsmith-static": "0.0.5",
     "metalsmith-templates": "0.6.0",
-    "metalsmith-unexpected-markdown": "2.1.0",
+    "metalsmith-unexpected-markdown": "2.2.0",
     "minimatch": "2.0.7",
     "passerror": "1.1.0",
     "stat-mode": "0.2.0",