Satisfy a linter check on CircleCI

Author: bzaczynski

arcade-platformer/readme.md arcade-platformer/README.mdarcade-platformer/readme.md renamed to arcade-platformer/README.md

@@ -1,13 +1,11 @@
-=================
-Arcade Platformer
-=================
+# Arcade Platformer
 
 Built to support the Arcade Platfomer article at https://realpython.com
 
 Assets downloaded from:
+
 - Tileset: https://opengameart.org/content/platformer-pack-redux-360-assets
-- Sounds: https://opengameart.org/content/63-digital-sound-effects-lasers-phasers-space-etc and
-    https://opengameart.org/content/51-ui-sound-effects-buttons-switches-and-clicks
+- Sounds: https://opengameart.org/content/63-digital-sound-effects-lasers-phasers-space-etc and https://opengameart.org/content/51-ui-sound-effects-buttons-switches-and-clicks
 - Credit for all assets: https://www.kenney.nl. Donations are suggested.
 
 Tilemaps created with https://www.mapeditor.org/, donation suggested.