docs: update invite link (#739)

change invite link from slack to discord

Signed-off-by: Kushal Kumar <[email protected]>

CONTRIBUTING.md

@@ -4,8 +4,8 @@
 We'd love for you to contribute to our source code and to make Cicero technology even better than it is today! Please refer to the [Accord Project Contribution guidelines][apcontribute] we'd like you to follow.
 
 ## Cicero Specific Information
-The main channel for support with Cicero is the [Cicero Slack Channel][apciceroslack] on the [Accord Project slack][apslack].
+The main channel for support with Cicero is the [#technology-cicero Discord Channel][apcicerodiscord] on the [Accord Project Discord][apdiscord].
 
 [apcontribute]: https://github.com/accordproject/techdocs/blob/master/CONTRIBUTING.md
-[apslack]: https://accord-project-slack-signup.herokuapp.com	
-[apciceroslack]: https://accord-project.slack.com/archives/CA08NAHQS
+[apdiscord]: https://discord.com/invite/Zm99SKhhtA
+[apcicerodiscord]: https://discord.gg/FZw5fwse

README.md

@@ -76,7 +76,7 @@ The Accord Project technology is being developed as open source. All the softwar
 
 Find out what’s coming on our [blog][apblog].
 
-Join the Accord Project Technology Working Group [Slack channel][apslack] to get involved!
+Join the Accord Project Technology Working Group [Discord channel][apdiscord] to get involved!
 
 For code contributions, read our [CONTRIBUTING guide][contributing] and information for [DEVELOPERS][developers].
 
@@ -100,7 +100,7 @@ Copyright 2018-2019 Clause, Inc. All trademarks are the property of their respec
 [apmain]: https://accordproject.org/ 
 [apblog]: https://medium.com/@accordhq
 [apdoc]: https://docs.accordproject.org/
-[apslack]: https://accord-project-slack-signup.herokuapp.com
+[apdiscord]: https://discord.com/invite/Zm99SKhhtA
 
 [contributing]: https://github.com/accordproject/cicero/blob/master/CONTRIBUTING.md
 [developers]: https://github.com/accordproject/cicero/blob/master/DEVELOPERS.md