Update dependency git-changelog to v1

Author: renovate[bot]

pyproject.toml

@@ -71,7 +71,7 @@ six = "^1.14"
 Django = {version = "^4.0.0"}
 check-manifest = {version = "^0.48", python = "^3.6"}
 bump2version = {version = "^1.0.0", python = "^3.6"}
-git-changelog = {version = "^0.6.0", python = "^3.6.2"}
+git-changelog = {version = "^1.0.0", python = "^3.6.2"}
 poetry = "=1.1.14"
 sphinx = "=4.5.0"
 sphinx-autobuild = "^2021.0.0"