pkg: add release script

Author: juliangruber

package.json

@@ -13,6 +13,7 @@
   },
   "scripts": {
     "prepublish": "make build",
+    "release": "np",
     "test": "make test"
   },
   "dependencies": {
@@ -32,6 +33,7 @@
   "devDependencies": {
     "browserify": "^14.1.0",
     "concat-stream": "^1.5.1",
+    "np": "^6.2.3",
     "tap": "^10.0.1",
     "tree-kill": "^1.0.0",
     "utf8-stream": "^0.0.0"