chore(package): update remark to version 9.0.0

Closes #9

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "documentation": "4.0.0-beta4",
     "jsdoctest": "1.7.0",
     "mocha": "3.2.0",
-    "remark": "^7.0.0",
+    "remark": "^9.0.0",
     "tap": "^10.3.2"
   }
 }