Update README supported versions

.github/ISSUE_TEMPLATE/mod_incompatibility.yml

@@ -42,9 +42,12 @@ body:
     id: version
     attributes:
       label: Minecraft version
-      description: What version of Minecraft are you running? Please note that only the versions listed below are supported. If you're running an outdated version, update to receive support.
+      description: |
+        What version of Minecraft are you running? Please note that only the versions listed below are supported. If you're running an outdated version, update to receive support.
+        LTS versions will only receive **critical bugfixes** and no compatibility patches will be made. 
       options:
-        - "1.20.1"
+        - "1.21.1"
+        - "1.20.1 (LTS)"
       default: 0
     validations:
       required: true

README.md

@@ -72,6 +72,14 @@ Here's a few tips to follow when reporting issues:
 Please note that providing as many details as possible is crucial to help us find and resolve the issue faster, while
 also getting you a fixed version ASAP.
 
+### Supported versions
+
+✅ **1.21** is our **primary supported version**.
+This is the one that will receive new fixes and compatibility improvements.
+
+⚠️ **1.20.1** is our **long-term-support** version and will still receive critical bugfixes.
+However, no compatibility fixes will be made.
+
 ## ⚖️ License
 
 Sinytra Connector is, and will always remain, licensed under the [MIT License](https://github.com/Sinytra/Connector/blob/master/LICENSE). All files in this repository should be