add v2 checkbox to issue template (#3903)

* add v2 checkbox to issue template

* add v2 checkbox to issue template (edited)

Author: vudh1

.github/ISSUE_TEMPLATE/---bug-report.md

@@ -11,7 +11,8 @@ Confirm by changing [ ] to [x] below to ensure that it's a bug:
 - [ ] I've gone through [Developer Guide](https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/welcome.html) and [API reference](https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/)
 - [ ] I've checked [AWS Forums](https://forums.aws.amazon.com) and [StackOverflow](https://stackoverflow.com/questions/tagged/aws-sdk-js) for answers
 - [ ] I've searched for [previous similar issues](https://github.com/aws/aws-sdk-js/issues) and didn't find any solution
-  
+- [ ] This is an issue with version 2.x of the SDK
+
 **Describe the bug**
 A clear and concise description of what the bug is.
 

.github/ISSUE_TEMPLATE/---feature-request.md

@@ -6,6 +6,8 @@ labels: feature-request
 assignees: ''
 
 ---
+Confirm by changing [ ] to [x] below:
+- [ ] This is a feature with version 2.x of the SDK
 
 **Is your feature request related to a problem? Please describe.**
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

.github/ISSUE_TEMPLATE/---known-issues.md

@@ -20,3 +20,4 @@ assignees: ''
 
 If you still like to open an issue, change [ ] to [x] below:
 - [ ] I've confirmed that I'm using latest version of SDK, and issue is still reproducible
+- [ ] This is an issue with version 2.x of the SDK

.github/ISSUE_TEMPLATE/---questions---help.md

@@ -10,5 +10,6 @@ assignees: ''
 Confirm by changing [ ] to [x] below:
 - [ ] I've gone through [Developer Guide](https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/welcome.html) and [API reference](https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/)
 - [ ] I've checked [AWS Forums](https://forums.aws.amazon.com) and [StackOverflow](https://stackoverflow.com/questions/tagged/aws-sdk-js) for answers
+- [ ] This is an issue with version 2.x of the SDK
 
 **Describe the question**