Updated node versions in test matrix (#41)

* Updated node versions in test matrix

* Removed broken Snyk badge

We don't have dependencies anyways

.github/workflows/pr-validation.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x]
+        node-version: [18.x, 20.x]
 
     steps:
     - uses: actions/checkout@v1

packages/kalm/README.md

@@ -13,7 +13,6 @@
 
 [![Kalm](https://img.shields.io/npm/v/kalm.svg)](https://www.npmjs.com/package/kalm)
 [![Build Status](https://github.com/kalm/kalm.js/workflows/master-status/badge.svg)](https://github.com/kalm/kalm.js/actions?query=workflow%3A+master-status)
-![Snyk Vulnerabilities for GitHub Repo](https://img.shields.io/snyk/vulnerabilities/github/kalm/kalm.js)
 [![Financial Contributors on Open Collective](https://opencollective.com/kalm/all/badge.svg?label=financial+contributors)](https://opencollective.com/kalm) 
 [![Join the chat at https://gitter.im/KALM/home](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/KALM/?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 ---