Elaborate on supported versions in BUG-REPORT.yml

.github/ISSUE_TEMPLATE/BUG-REPORT.yml

@@ -57,10 +57,16 @@ body:
     id: version
     attributes:
       label: Version
-      description: What version of iced are you using? Please ensure it's the latest patch.
+      description: |
+        We only offer support for the `0.4` release on crates.io and the `master`
+        branch on this repository. Which version are you using? Please make sure
+        you are using the latest patch available (e.g. run `cargo update`).
+
+        If you are using an older release, please upgrade to `0.4` before filing
+        an issue.
       options:
         - master
-        - "0.4"
+        - 0.4
     validations:
       required: true
   - type: dropdown