chore: use nox and release-please; drop 3.4 (#852)



Co-authored-by: Kamil BreguĊ‚a <mik-laj@users.noreply.github.com>
Co-authored-by: Christopher Wilcox <crwilcox@google.com>
diff --git a/.gitignore b/.gitignore
index cf2c4a6..1637b1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,7 +5,7 @@
 dist/
 
 # Test files
-.tox/
+.nox/
 
 # Coverage files
 .coverage