Update README.md

README.md

 ### How to make and install the APK
 
-1. Download the APK maker from [Start Gamedev](https://qubodup.itch.io/startgamedev)
+1. Download the APK maker from [Start Gamedev](https://qubodup.itch.io/startgamedev).
 
 2. Create a zip file with the `assets` folder, `hump` folder, and `main.lua`. Rename this zip file to `game.love`.