formatting: change hooks and add a reminder

GovanifY · GovanifY · commit faa081e4d13a · 2021-04-01T11:48:11.000+02:00
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
@@ -1,4 +1,5 @@
+repos:
 -   repo: https://github.com/nix-community/nixpkgs-fmt
-    rev: master
+    rev: v1.2.0
     hooks:
     -   id: nixpkgs-fmt
diff --git a/README.md b/README.md
@@ -8,3 +8,5 @@ Currently the machines populated by this configuration are:
 * alastor
 * xanadu
 
+Do not forget to run `pre-commit install` to get the formatting hooks running
+before contributing!
