chore(infra): adds chat badge

Relates to #1

Author: stalniy

README.md

@@ -2,6 +2,7 @@
 
 ![build](https://github.com/stalniy/ucast/workflows/CI/badge.svg)
 [![CASL codecov](https://codecov.io/gh/stalniy/ucast/branch/master/graph/badge.svg)](https://codecov.io/gh/stalniy/ucast)
+[![UCAST join the chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/stalniy-ucast/community)
 
 `ucast` is a low level library that helps to create awesome things! It aims to be a universal way to represent a set of conditions that can be transferred between APIs and databases.
 

packages/core/README.md

@@ -2,6 +2,7 @@
 
 [![@ucast/core NPM version](https://badge.fury.io/js/%40ucast%2Fcore.svg)](https://badge.fury.io/js/%40ucast%2Fcore)
 [![](https://img.shields.io/npm/dm/%40ucast%2Fcore.svg)](https://www.npmjs.com/package/%40ucast%2Fcore)
+[![UCAST join the chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/stalniy-ucast/community)
 
 This package contains classes and functions that helps to create parsers, conditions AST, interpreters and translators.
 

packages/js/README.md

@@ -2,6 +2,7 @@
 
 [![@ucast/js NPM version](https://badge.fury.io/js/%40ucast%2Fjs.svg)](https://badge.fury.io/js/%40ucast%2Fjs)
 [![](https://img.shields.io/npm/dm/%40ucast%2Fjs.svg)](https://www.npmjs.com/package/%40ucast%2Fjs)
+[![UCAST join the chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/stalniy-ucast/community)
 
 This package is a part of [ucast] ecosystem. It provides interpreter that can execute conditions AST in JavaScript against any JavaScript object.
 

packages/mongo/README.md

@@ -2,6 +2,7 @@
 
 [![@ucast/mongo NPM version](https://badge.fury.io/js/%40ucast%2Fmongo.svg)](https://badge.fury.io/js/%40ucast%2Fmongo)
 [![](https://img.shields.io/npm/dm/%40ucast%2Fmongo.svg)](https://www.npmjs.com/package/%40ucast%2Fmongo)
+[![UCAST join the chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/stalniy-ucast/community)
 
 This package is a part of [ucast] ecosystem. It provides a parser that can parse [MongoDB query](https://docs.mongodb.com/manual/reference/operator/query/) into conditions AST.