chore: add prepublish script (#89)

Author: erezrokah

CONTRIBUTING.md

@@ -39,6 +39,4 @@ After submitting the pull request, please make sure the Continuous Integration c
 ## Releasing
 
 1. Merge the release PR
-2. Switch to the default branch `git checkout master`
-3. Pull latest changes `git pull`
-4. Publish the package `npm publish`
+2. Publish the package `npm publish`

package.json

@@ -27,7 +27,12 @@
     "test:dev": "run-s test:dev:*",
     "test:ci": "run-s test:ci:*",
     "test:dev:ava": "ava",
-    "test:ci:ava": "nyc -r lcovonly -r text -r json ava"
+    "test:ci:ava": "nyc -r lcovonly -r text -r json ava",
+    "prepublishOnly": "run-s prepublishOnly:*",
+    "prepublishOnly:checkout": "git checkout master",
+    "prepublishOnly:pull": "git pull",
+    "prepublishOnly:install": "npm ci",
+    "prepublishOnly:test": "npm test"
   },
   "scriptsArgs": {
     "eslint": "--ignore-path .gitignore --cache --format=codeframe --max-warnings=0 \"{bin,.github}/**/*.{js,md,html}\" \".*.js\"",