Increase wording consistency and add Slack link to link list.

README.md

@@ -2,14 +2,15 @@
 ![Platform](https://img.shields.io/badge/platform-Android-blue.svg)
 [![License](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![Build status](https://circleci.com/gh/opendatakit/collect.svg?style=shield&circle-token=:circle-token)](https://circleci.com/gh/opendatakit/collect)
-[![Slack Status](http://slack.opendatakit.org/badge.svg)](http://slack.opendatakit.org)
+[![Slack status](http://slack.opendatakit.org/badge.svg)](http://slack.opendatakit.org)
 
 ODK Collect is an Android app for filling out forms. It is designed to be used in resource-constrained environments with challenges such as unreliable connectivity or power infrastructure. ODK Collect is part of Open Data Kit (ODK), a free and open-source set of tools which help organizations author, field, and manage mobile data collection solutions. Learn more about the Open Data Kit project and its history [here](https://opendatakit.org/about/) and read about example ODK deployments [here](https://opendatakit.org/about/deployments/).
 
 * ODK website: [https://opendatakit.org](https://opendatakit.org)
-* ODK Collect usage instructions: [https://opendatakit.org/use/collect/](https://opendatakit.org/use/collect/)
+* ODK Collect usage instructions: [https://opendatakit.org/use/collect](https://opendatakit.org/use/collect/)
 * ODK community mailing list: [http://groups.google.com/group/opendatakit](http://groups.google.com/group/opendatakit)
 * ODK developer mailing list: [http://groups.google.com/group/opendatakit-developers](http://groups.google.com/group/opendatakit-developers)
+* ODK developer Slack chat: [http://slack.opendatakit.org](http://slack.opendatakit.org)
 * ODK developer wiki: [https://github.com/opendatakit/opendatakit/wiki](https://github.com/opendatakit/opendatakit/wiki)
 
 ## Setting up your development environment