Update README.md

Capitalized the "Formerly known..." text + rearranged the community section and mention the slack channel.

README.md

@@ -4,7 +4,7 @@
 [![devDependency Status](https://david-dm.org/atom/electron/dev-status.svg)](https://david-dm.org/atom/electron#info=devDependencies)
 [![Join the Electron Community on Slack](http://atom-slack.herokuapp.com/badge.svg)](http://atom-slack.herokuapp.com/)
 
-:zap: *formerly known as Atom Shell* :zap:
+:zap: *Formerly known as Atom Shell* :zap:
 
 The Electron framework lets you write cross-platform desktop applications
 using JavaScript, HTML and CSS. It is based on [io.js](http://iojs.org) and
@@ -15,7 +15,8 @@ Follow [@ElectronJS](https://twitter.com/electronjs) on Twitter for important
 announcements.
 
 This project adheres to the [Contributor Covenant 1.2](http://contributor-covenant.org/version/1/2/0).
-By participating, you are expected to uphold this code. Please report unacceptable behavior to [email protected].
+By participating, you are expected to uphold this code. Please report 
+unacceptable behavior to [email protected].
 
 ## Downloads
 
@@ -54,7 +55,12 @@ contains documents describing how to build and contribute to Electron.
 
 ## Community
 
-There is an [`electron` category on the Atom forums](http://discuss.atom.io/category/electron)
-as well as an `#atom-shell` channel on Freenode.
+You can ask questions and interact with the community in the following 
+locations:
+- [`electron`](http://discuss.atom.io/category/electron) category on the Atom 
+forums
+- `#atom-shell` channel on Freenode
+- [`Atom`](http://atom-slack.herokuapp.com/) channel on Slack
 
-Check out [awesome-electron](https://github.com/sindresorhus/awesome-electron) for a community maintained list of useful example apps, tools and resources.
+Check out [awesome-electron](https://github.com/sindresorhus/awesome-electron) 
+for a community maintained list of useful example apps, tools and resources.