Change emoji for Bulgaria in index.md

Updated emoji representation for Bulgaria in the description.

Author: profjordanov

collections/made-in-bulgaria/index.md

@@ -1,8 +1,12 @@
 ---
 items:
+ - NikolayIT/OpenJudgeSystem
+ - dnikolovv/dev-adventures-realworld
+ - ivaylokenov/MyTested.AspNetCore.Mvc
  - profjordanov/students-manager
+ - stilianstefanov/Vehicles-Marketplace-System
 display_name: Made in Bulgaria
 created_by: profjordanov
 image: made-in-bulgaria.png
 ---
-Open source projects built in or receiving significant contributions from Bulgaria :bg:
+Open source projects built in or receiving significant contributions from Bulgaria :bulgaria: