Update GitHub PR template (#1383)

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,18 +5,3 @@ Closes #    <!-- Enter the issue number this PR addresses. If none, remove this
 ---
 ### New Version Info
 
-#### Author's Instructions
-- [ ] Derive a new `MAJOR.MINOR.PATCH` version number. Increment the:
-    - `MAJOR` version when you make incompatible API changes
-    - `MINOR` version when you add functionality in a backwards-compatible manner
-    - `PATCH` version when you make backwards-compatible bug fixes
-- [ ] Update [CHANGELOG.md](https://github.com/scrooloose/nerdtree/blob/master/CHANGELOG.md), following the established pattern.
-#### Collaborator's Instructions
-- [ ] Review [CHANGELOG.md](https://github.com/scrooloose/nerdtree/blob/master/CHANGELOG.md), suggesting a different version number if necessary.
-- [ ] After merging, tag the commit using these (Mac-compatible) bash commands:
-    ```bash
-    git checkout master
-    git pull
-    sed -n "$(grep -n -m2 '####' CHANGELOG.md | cut -f1 -d: | sed 'N;s/\n/,/')p" CHANGELOG.md | sed '$d'
-    git tag -a $(read -p "Tag Name: " tag;echo $tag) -m"$(git show --quiet --pretty=%s)";git push origin --tags
-    ```