Switch the project from 0xacab to github

While the folks running 0xacab are much more lovely than the github ones, this
project has outgrown the former:

- Github offers beefy continuous integration, make it easier to run the
  testsuite on every python version, instead of using a weird docker-based
  contraption. Moreover, I'd rather burn some Microsoft money than 0xacab one.
- Opening an account on 0xacab is non-trivial (by design), making it tedious
  for people to report issues and contribute to mat2.
- Gitlab is becoming unbearably slow and convoluted, even compared to Github's
  awful Copilot/AI push.

It's a sad state of affairs, but it's a pragmatic decision. People who don't
have a Github account can still report issues and send patches by sending me an
email.

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index bf4c4ac..45a24f1 100644
--- a/README.md
+++ b/README.md
@@ -149,7 +149,7 @@ of the guarantee that mat2 won't modify the data of their files, there is the
 
 # Contact
 
-If possible, use the [issues system](https://0xacab.org/jvoisin/mat2/issues)
+If possible, use the [issues system](https://github.com/jvoisin/mat2/issues)
 or the [mailing list](https://www.autistici.org/mailman/listinfo/mat-dev)
 Should a more private contact be needed (eg. for reporting security issues),
 you can email Julien (jvoisin) Voisin at `julien.voisin+mat2@dustri.org`,