Add Antimine to open source games list (#100)

Author: lucasnlm

README.md

@@ -108,6 +108,7 @@
 #### Casual
 
 <!--lint ignore double-link-->
+- [Antimine - Minesweeper](https://github.com/lucasnlm/antimine-flutter) - Antimine is a minesweeper-like puzzle game. The objective is to flag the spaces with mines to make the field a safer place without exploding any of them. Get it on [Google Play](https://play.google.com/store/apps/details?id=com.logical.minato). By [lucasnlm](https://github.com/lucasnlm).
 - [Bob Box](https://github.com/fireslime/bounce_box) - A simple casual game that you can play with one finger. Tap to stop, avoid obstacles! By [FireSlime](https://fireslime.xyz)
 - [Snaake!](https://github.com/lucasnlm/snaake-flutter) - A simple casual snake game. By [lucasnlm](https://github.com/lucasnlm)
 - [Ghost Rigger](https://github.com/Float-like-a-dash-Sting-like-a-dart/GhostRigger) - A cyberpunk inspired puzzle game, build for Flutter Hackathon Hack20. By [b099l3](https://github.com/b099l3) and [ernestoyaquello](https://github.com/ernestoyaquello)