Update PULL_REQUEST_TEMPLATE.md

Author: Kyaa-dost

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- 🚨 It is essential to keep the **☑️ Allow edits by maintainers** checked in Pull Request Template as it increases collaboration by permitting commits to the PR branch created from a fork 🚨 -->
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 ## Fixes #
 <!-- Add the relevant issue number after the "#" mentioned above (for ex: Fixes #1234) which will automatically close the issue once the PR is merged. -->