Add bump2version (to avoid mistakes like pushing wrong tag names)

.bumpversion.cfg

@@ -0,0 +1,7 @@
+[bumpversion]
+current_version = 1.7.1
+commit = True
+tag = True
+
+[bumpversion:file:fbchat/__init__.py]
+

pyproject.toml

@@ -60,3 +60,7 @@ docs = [
 lint = [
     "black",
 ]
+tools = [
+    # Fork of bumpversion, see https://github.com/c4urself/bump2version
+    "bump2version~=0.5.0",
+]