feat(size): smaller npm install size

package.json

@@ -5,12 +5,17 @@
   "main": "index.js",
   "scripts": {
     "test": "node test/chdir-promise-spec.js",
-    "semantic-release": "semantic-release pre && npm publish && semantic-release post"
+    "semantic-release": "semantic-release pre && npm publish && semantic-release post",
+    "commit": "commit-wizard",
+    "size": "t=\"$(npm pack .)\"; wc -c \"${t}\"; tar tvf \"${t}\"; rm \"${t}\";"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/bahmutov/chdir-promise.git"
   },
+  "files": [
+    "index.js"
+  ],
   "keywords": [
     "chdir",
     "change",
@@ -36,8 +41,17 @@
     "spots": "0.4.0"
   },
   "devDependencies": {
-    "pre-git": "0.1.1",
+    "pre-git": "^3.11.1",
     "semantic-release": "^6.3.2"
   },
-  "pre-commit": "npm test"
+  "config": {
+    "pre-git": {
+      "commit-msg": "simple",
+      "pre-commit": ["npm test"],
+      "pre-push": ["npm run size"],
+      "post-commit": [],
+      "post-checkout": [],
+      "post-merge": []
+    }
+  }
 }