chore: warn about Node.js 13.x incompatibility in issue template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -6,6 +6,11 @@ labels: ''
 assignees: ''
 ---
 
+<!--
+READ THIS FIRST: If you are using Node.js 13.x please make sure to upgrade to the latest Node.js
+version first before filing your bug report. Node.js 13.x is NOT supported by this library.
+-->
+
 ## Describe the bug
 
 A clear and concise description of what the bug is.
@@ -26,7 +31,7 @@ A clear and concise description of what you expected to happen.
 
 - OS: [e.g. macOS, Linux]
 - Runtime: [e.g. Node.js, Chrome, Safari, react-native, AWS Lambda]
-- Runtime Version: [e.g. 13.5.1]
+- Runtime Version: [e.g. 14.2.0]
 
 ## Additional context