update install

package-lock.json

@@ -0,0 +1,14 @@
+{
+  "name": "shell",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "shell",
+      "version": "1.0.0",
+      "hasInstallScript": true,
+      "license": "ISC"
+    }
+  }
+}

package.json

@@ -4,6 +4,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
+    "postinstall": "node build.js",
     "test": "echo \"Error: no test specified\" && exit 1",
     "build": "node build.js"
   },