Change versions in CONTRIBUTING.md

Author: nightlinus

CONTRIBUTING.md

@@ -7,9 +7,9 @@ feel free to do this, but remember to follow this few simple rules:
 Branching strategy
 -------------------
 
-- For new features, or bugs that only affect the 3.x versions, base your changes on the `master` branch and open PRs against `master`
-- For bugs that affect 2.5.x versions, base your changes on the `2.5` branch and open PRs agains `2.5`
-- Bugs in previous versions are not going to be fixed, upgrade to `2.5` minimum.
+- For new features, or bugs that only affect the 4.x versions, base your changes on the `master` branch and open PRs against `master`
+- For bugs that affect 3.4.x versions, base your changes on the `3.4` branch and open PRs agains `3.4`
+- Bugs in previous versions are not going to be fixed, upgrade to `3.4` minimum.
 
 Coverage
 --------