Add version information to setup.cfg

Version ``0.11.6.dev1`` means that the current main branch is in
development phase of an upcoming 0.11.6 release.

Resolves: #91
Signed-off-by: Christian Heimes <[email protected]>

Author: tiran

setup.cfg

@@ -1,5 +1,6 @@
 [metadata]
 name = setuptools-rust
+version = 0.11.6.dev1
 author = Nikolay Kim
 author_email = [email protected]
 license = MIT