Added docs for publishing new version

Author: lightningspirit

docs/PUBLISH.md

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+# How to publish a new version?
+
+1. Run tests (if there are any)
+2. Update `version` in `package.json` according to Semver
+3. Create a git tag according to Semver
+4. Push the package to Github
+5. Push the package to npm `npm publish`
+6. Create release notes for every update
+
+Source: [How to publish packages to npm (the way the industry does things)](https://zellwk.com/blog/publish-to-npm/)