README.MD Step 3 execute `yarn` command ends up in an error

[andreimarcut]

When I perform the steps for the first time based on the instructions in the , I get an error:

Recipe for making a pull request from README.MD

1. Fork and checkout repo locally.
   ✅ ok
2. Install Yarn, if you do not have it yet. For example via npm i yarn -g.
   ✅ ok
3. Open a command line, move to the project directory and run yarn to install all dependencies.
   🛑 error "./build/markdown-editor-core-0.0.9.tgz": Tarball is not in network and can not be located in cache

$ yarn
yarn install v1.22.10
warning ../../../package.json: No license field
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
error "./build/markdown-editor-core-0.0.9.tgz": Tarball is not in network and can not be located in cache ([".../mdefy/markdown-editor-core/build/markdown-editor-core-0.0.9.tgz",".../Library/Caches/Yarn/v6/npm-markdown-editor-core-0.0.0-8af8f6e3041cd5cbdabc87520fb5741668841f0c/node_modules/markdown-editor-core/.yarn-tarball.tgz"])
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

RCA

In package.json:39 there's a hardcoded tarball dependency:

  "dependencies": {
    "markdown-editor-core": "./build/markdown-editor-core-0.0.9.tgz"
  },

This file doesn't exist.