chore: update Aragon chat links (#1349)

CONTRIBUTING.md

@@ -44,7 +44,7 @@ If the answer to either of those two questions are "yes", then you're probably d
 ## Fixing issues
 
 1. [Find an issue](https://github.com/aragon/aragon/issues) that you are interested in.
-    - You may want to ask on the issue or on Aragon Chat's [#dev channel](https://aragon.chat/channel/dev) if anyone has already started working on the issue.
+    - You may want to ask on the issue or in the [Aragon Client Spectrum channel](https://spectrum.chat/aragon/aragon-client) if anyone has already started working on the issue.
 1. Fork and clone a local copy of the repository.
 1. Make the appropriate changes for the issue you are trying to address or the feature that you want to add.
 1. Push the changes to the remote repository.
@@ -76,4 +76,4 @@ We generally avoid adding external dependencies if they can be ported over easil
 
 ## Community
 
-If you need help, please reach out to Aragon core contributors and community members in the Aragon Chat [#dev](https://aragon.chat/channel/dev) and [#dev-help](https://aragon.chat/channel/dev-help) channels. We'd love to hear from you and know what you're working on!
+If you need help, please reach out to Aragon core contributors and community members in the [Aragon Client Spectrum channel](https://spectrum.chat/aragon/aragon-client).  We'd love to hear from you and know what you're working on!

README.md

@@ -10,8 +10,8 @@
 - 📚 Read the [User Guide](https://help.aragon.org/) first, if you have any questions as a user.
 - 💻 You may be interested in [Aragon Desktop](https://github.com/aragon/aragon-desktop/), the most decentralized Aragon experience to date.
 - 🏗 If you'd like to develop an Aragon app, please visit the [Aragon Developer Portal](https://hack.aragon.org).
-- 📝 Please report any issues and feedback in the [Aragon Chat #feedback](https://aragon.chat/channel/feedback) channel.
-- 🔧 For technical stuff, use this project's [issues](http://github.com/aragon/aragon/issues) or join the technical conversation in our [#dev](https://aragon.chat/channel/dev) channel.
+- 📝 Please report any issues and feedback in the [Aragon Client channel](https://spectrum.chat/aragon/aragon-client).
+- 🔧 For technical stuff, use this project's [issues](http://github.com/aragon/aragon/issues) or join the technical conversation in our [Developer hangout](https://spectrum.chat/aragon/general-development) channel.
 - 📖 To learn more about contributing to the Aragon client itself, please check the [contributing guide](./CONTRIBUTING.md)
 - 🚢 For an overview of what changed with each release, check the [releases](https://github.com/aragon/aragon/releases) and [changelog](https://github.com/aragon/aragon/blob/master/CHANGELOG.md).