👷 Fix the rebuild recipe script

For some reason the git diff command was no longer returning a list, refs:
#898 (comment)

.ci/rebuild_updated_recipes.py

@@ -22,10 +22,10 @@ def modified_recipes(branch="origin/master"):
     # with a bunch of fixes, e.g. disabled TTY, see:
     # https://stackoverflow.com/a/20128598/185510
     sh.contrib.git.fetch("origin", "master")
-    git_diff = sh.contrib.git.diff("--name-only", "--diff-filter=d", branch)
+    git_diff = sh.contrib.git.diff("--name-only", "--diff-filter=d", branch).split("\n")
     recipes = set()
     for file_path in git_diff:
-        if fnmatch(file_path, "kivy_ios/recipes/*/__init__.py\n"):
+        if fnmatch(file_path, "kivy_ios/recipes/*/__init__.py"):
             recipe = file_path.split("/")[2]
             recipes.add(recipe)
     return recipes

README.md

@@ -8,7 +8,7 @@
 ![PyPI - Version](https://img.shields.io/pypi/v/kivy-ios)
 ![PyPI - Python Version](https://img.shields.io/pypi/pyversions/kivy-ios)
 
-[![kivy-ios](https://github.com/kivy/kivy-ios/workflows/kivy-ios/badge.svg)](https://github.com/kivy/kivy-ios/actions?query=workflow%3Akivy-ios)
+[![kivy-ios](https://github.com/kivy/kivy-ios/actions/workflows/kivy_ios.yml/badge.svg)](https://github.com/kivy/kivy-ios/actions/workflows/kivy_ios.yml)
 
 Kivy for iOS (kivy-ios) is a toolchain to compile the necessary libraries for 
 [iOS](https://www.apple.com/ios/) to run [Kivy](https://kivy.org) applications,