diff --git a/README.md b/README.md
index d1f6d93..79b19a5 100644
--- a/README.md
+++ b/README.md
@@ -124,7 +124,7 @@ Add a Microsoft Teams integration with an URL ending with `?formatter=gitlab_tea
 
 #### Github Release Notifier
 
-To receiver notifications about new releases of projects hosted at github.com you can add a matrix webhook ending with `?formatter=grn&key=API_KEY` to [Github Release Notifier (grn)](https://github.com/femtopixel/github-release-notifier).  
+To receiver notifications about new releases of projects hosted at github.com you can add a matrix webhook ending with `?formatter=grn&key=API_KEY` to [Github Release Notifier (grn)](https://github.com/femtopixel/github-release-notifier).
 
 ## Test room
 
diff --git a/matrix_webhook/formatters.py b/matrix_webhook/formatters.py
index be3ad33..25c5cd2 100644
--- a/matrix_webhook/formatters.py
+++ b/matrix_webhook/formatters.py
@@ -75,8 +75,10 @@ def gitlab_teams(data, headers):
 
 def grn(data, headers):
     """Pretty-print a github release notifier (grn) notification."""
-    version, title, author, package  = (
-         data[k] for k in ["version", "title", "author", "package_name"]
+    version, title, author, package = (
+        data[k] for k in ["version", "title", "author", "package_name"]
     )
-    data["body"] = f"### {package} - {version}\n\n{title}\n\n[{author} released new version **{version}** for **{package}**](https://github.com/{package}/releases/tag/{version}).\n\n"
+    data[
+        "body"
+    ] = f"### {package} - {version}\n\n{title}\n\n[{author} released new version **{version}** for **{package}**](https://github.com/{package}/releases/tag/{version}).\n\n"
     return data