setup.cfg: bump version to 2.3.8 (#705)

Author: simondeziel

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = pylxd
-version = 2.3.7
+version = 2.3.8
 description = python library for LXD
 long_description = file: README.rst
 long_description_content_type = text/x-rst