Upgrade hallmark devDependency from ^0.1.0 to ^1.0.0 (#664)

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "delayed": "^2.0.0",
     "dependency-check": "^3.3.0",
     "encoding-down": "^6.0.0",
-    "hallmark": "^0.1.0",
+    "hallmark": "^1.0.0",
     "level-community": "^3.0.0",
     "memdown": "^4.0.0",
     "nyc": "^14.0.0",