Update github meta documentation (#154)

- Update issue template
- Update supported versions documentation

Author: jamesrweb

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,9 @@
-Fixes issue #
+Fixes #
 
 ## Proposed Changes
 
 -
 -
 -
+
+## Additional Notes (optional)

.github/SECURITY.md

@@ -2,13 +2,10 @@
 
 ## Supported Versions
 
-| Version  | Supported          |
-| -------- | ------------------ |
-| 3.1.0    | :white_check_mark: |
-| 3.0.2    | :white_check_mark: |
-| 3.0.1    | :white_check_mark: |
-| 3.0.0    | :white_check_mark: |
-| <= 2.4.1 | :x:                |
+| Version | Supported          |
+| ------- | ------------------ |
+| > 3.0.0 | :white_check_mark: |
+| < 3.0.0 | :x:                |
 
 ## Reporting a Vulnerability