move support to https://www.reddit.com/r/uMatrix/

.github/ISSUE_TEMPLATE.md

@@ -11,7 +11,7 @@ uMatrix is for advanced users. Do not use the issue tracker to ask for
 support if you have issues using uMatrix.
 
 For question/support/discussions, there is Mozilla Discourse:
-https://discourse.mozilla-community.org/t/support-umatrix/5131
+https://www.reddit.com/r/uMatrix/
 
 For documentation:
 https://github.com/gorhill/uMatrix/wiki

CONTRIBUTING.md

@@ -6,7 +6,7 @@
 
 **The issue tracker is for provable issues only:** You will have to make the case that the issue is really with uMatrix and not something else on your side. To make a case means to provide detailed steps so that anybody can reproduce the issue. Be sure to rule out that the issue is not caused by something specific on your side.
 
-For **support/discussions**, there is [Mozilla Discourse](https://discourse.mozilla-community.org/t/support-umatrix/5131).
+For **support/discussions**, there is [/r/uMatrix](https://www.reddit.com/r/uMatrix/).
 
 Issues opened which are not actual issues with the code will be closed as _invalid_ without further comment.
 

README.md

@@ -4,7 +4,7 @@ Definitely for advanced users.
 
 ***
 
-Keep Github issues for actual bugs. User support is [Mozilla's add-on-support](https://discourse.mozilla-community.org/t/support-umatrix/5131).
+Keep Github issues for actual bugs. User support is [/r/uMatrix](https://www.reddit.com/r/uMatrix/).
 
 Forked and refactored from [HTTP Switchboard](https://github.com/gorhill/httpswitchboard).