Add bumpversion config

.bumpversion.cfg

@@ -0,0 +1,18 @@
+[bumpversion]
+current_version = 0.9.0
+commit = True
+message = Release v{new_version}
+tag = True
+tag_name = v{new_version}
+
+[bumpversion:file:vimiv/__init__.py]
+serialize = ({major}, {minor}, {patch})
+
+[bumpversion:file:misc/org.karlch.vimiv.qt.metainfo.xml]
+search = <!-- Add new releases here -->
+replace = <!-- Add new releases here -->
+	<release version="{new_version}" date="{now:%Y-%m-%d}"/>
+
+[bumpversion:file:docs/changelog.rst]
+search = (unreleased)
+replace = ({now:%Y-%m-%d})