Revert "setup.py: use versioning=dev (#16)" (#42)

This reverts commit f0b4b78.

`versioning=devcommit` is more explicit / provides more info.

Author: blueyed

setup.py

@@ -33,7 +33,7 @@
 setup(
     name="pyrepl",
     setup_requires="setupmeta",
-    versioning="dev",
+    versioning="devcommit",
     author="Michael Hudson-Doyle",
     author_email="[email protected]",
     maintainer="Daniel Hahler",