TrinityCore/pull_request_template.md

Changes proposed:

Target branch(es): 3.3.5/master

Issues addressed: Closes #

Tests performed: (Does it build, tested in-game, etc.)

Known issues and TODO list:

DEPRECATION NOTICE When creating new PRs to the (old) 6.x branch, make sure the target branch is master instead of 6.x. NOTE Enable the setting "Allow edits from maintainers." when creating your pull request.
NOTE If this PR only contains SQL files, create an issue instead.
NOTE Squashing commits is not required.
SUGGESTION When adding new SQL files, name them 9999_99_99_99_db_name.sql to reduce the chance of possible merge conflicts.