Added GATs into data/acronyms.json (#134)

* Add GATs 

GATs was add with an usage and two example.

* Add GATs

GATs was add with an usage and two example.
#129

Author: KatShulu

data/acronyms.json

@@ -210,6 +210,13 @@
     "Usage": "",
     "Example": "<a href=\"https://github.com/ArduPilot/MissionPlanner/issues/2216\">ArduPilot</a>, <a href=\"https://fsharp.slack.com/archives/C1JH32U5D/p1635256259002400\">F#'s slack</a>"
   },
+  {
+      "Abbreviation": "GATs",
+      "Definition": "Generic Associated Types",
+      "Usage": "they allow you to define type, lifetime, or const generics on associated types",
+      "Example": "<a href=\"https://old.reddit.com/r/rust/comments/ynvm8a/could_someone_explain_the_gats_like_i_was_5\">Reddit</a>, <a href=\"https://blog.rust-lang.org/2021/08/03/GATs-stabilization-push.html\">rust-lang</a>"
+    
+  },
   {
     "Abbreviation": "GUI",
     "Definition": "Graphical User Interface",