add zest.releaser settings

Author: mcflugen

setup.cfg

@@ -4,3 +4,7 @@ ignore = C901, E203, E266, E501, E741, W503, B905
 max-line-length = 88
 max-complexity = 18
 select = B,C,E,F,W,T4,B9
+
+[zest.releaser]
+tag-format = v{version}
+python-file-with-version = barrier3d/_version.py