change master to main in pull_request_template.md (#23)

Author: geekypandey

.github/pull_request_template.md

@@ -3,7 +3,7 @@
 
 - [ ] An issue/feature request has been created for this PR
 - [ ] Pull Request title clearly describes the work in the pull request and the Pull Request description provides details about how to validate the work. Missing information here may result in a delayed response.
-- [ ] File the PR against the `master` branch
+- [ ] File the PR against the `main` branch
 - [ ] The code in this PR is covered by unit tests
 
 #### Link to issue/feature request: *add the link here*