update readme during npm version runs

package.json

@@ -5,7 +5,9 @@
   "main": "index.js",
   "scripts": {
     "lint": "eslint index.js settings.js",
-    "test": "eslint index.js settings.js && jest --coverage"
+    "test": "eslint index.js settings.js && jest --coverage",
+    "version": "./update-readme.sh",
+    "postversion": "git tag --delete v$npm_new_version"
   },
   "repository": {
     "type": "git",

update-readme.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+echo "old_version: $npm_old_version"
+echo "new_version: $npm_new_version"
+echo "package_name: $npm_package_name"
+
+sed -i '' "s/$npm_package_name@v$npm_old_version/$npm_package_name@v$npm_new_version/g" README.md
+
+git add README.md