Add a template for GMT release checklist (#893)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,9 @@
 ---
 name: Bug report
 about: Report a problem/bug to help us improve
+title: ''
+labels: ''
+assignees: ''
 
 ---
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,6 +1,9 @@
 ---
 name: Feature request
 about: Request the addition of a new feature/functionality
+title: ''
+labels: ''
+assignees: ''
 
 ---
 

.github/ISSUE_TEMPLATE/release_checklist.md

@@ -0,0 +1,55 @@
+---
+name: GMT Release Checklist
+about: Checklist for a new GMT release.
+title: 'Release GMT x.x.x'
+labels: ''
+assignees: ''
+
+---
+
+**Version**: x.x.x
+
+**Before release**:
+
+- [ ] run `src/gmt_make_*.sh` to update some .c and .h files
+- [ ] check if all tests pass on macOS, Linux and Windows
+- [ ] update changelog
+- [ ] update INSTALL.md
+- [ ] build documentations and fix warnings if any
+- [ ] check/set values in `cmake/ConfigDefault.cmake`
+ - [ ] `GMT_VERSION_YEAR` is current year
+ - [ ] `GMT_PACKAGE_VERSION_*` is correctly set
+ - [ ] `GMT_LIB_SOVERSION` is correctly set
+ - [ ] set `GMT_PUBLIC_RELEASE` to `TRUE`
+- [ ] freeze codes and commit all changes to GitHub
+
+**Release**:
+
+- [ ] create source tarballs (tar.gz and tar.xz) (@PaulWessel)
+- [ ] create macOS bundle (@PaulWessel)
+- [ ] create Windows installers (win32 and win64) (@joa-quim)
+- [ ] make a tag and push it to github
+ ```
+ git tag x.x.x
+ git push --tags
+ ```
+- [ ] go to [GitHub Release](https://github.com/GenericMappingTools/gmt/releases) and make a release. Remember to attach the source tarballs, macOS bundle and Windows installers.
+- [ ] upload source tarballs, macOS bundle, Windows installers to the GMT FTP (@PaulWessel)
+- [ ] update README and VERSION files on the GMT FTP
+- [ ] make announcements
+
+**After release**:
+
+- [ ] update `GMT_PACKAGE_VERSION_*` in `cmake/ConfigDefault.cmake`
+- [ ] set `GMT_PUBLIC_RELEASE` to `FALSE`
+
+**3rd-party update**
+
+- [ ] update [conda-forge feedstock](https://github.com/conda-forge/gmt-feedstock) (@leouieda, @seisman)
+- [ ] update [homebrew formula](https://github.com/Homebrew/homebrew-core/blob/master/Formula/gmt.rb) (@seisman)
+- [ ] update fink package (@remkos)
+- [ ] update macports ports
+
+---
+
+- [ ] Party :tada: (don't tick before all other checkboxes are ticked!)