Merge pull request #43 from CybercentreCanada/update/contributing

Updating the CONTRIBUTING.md to include relevant links

CONTRIBUTING.md

@@ -4,8 +4,8 @@ This guide covers the basics of how to contribute to the Assemblyline project.
 
 Python code should follow the PEP8 guidelines defined here: [PEP8 Guidelines](https://www.python.org/dev/peps/pep-0008/).
 
-## Tell us what you want to build/fix
-Before you start coding anything you should connect with the [Assemblyline community](https://groups.google.com/d/forum/cse-cst-assemblyline) to make sure no one else is working on the same thing and that whatever you are going to build still fits with the vision of the system.
+## Tell us want you want to build/fix
+Before you start coding anything you should connect with the Assemblyline community via the [Assemblyline Discord server](https://discord.gg/GUAy9wErNu) and/or the [central Assemblyline GitHub project](https://github.com/CybercentreCanada/assemblyline/issues) to make sure no one else is working on the same thing and that whatever you are going to build still fits with the vision of the system.
 
 ## Git workflow
 
@@ -18,7 +18,7 @@ Before you start coding anything you should connect with the [Assemblyline commu
 #### Transfer your service repo
 If you've worked on a new service that you want to be included in the default service selection you'll have to transfer the repo into our control.
 
-#### You are not allow to merge:
+#### You are not allowed to merge:
 
 Even if you try to merge in your pull request, you will be denied. Only a few people in our team are allowed to merge code into our repositories.