compat!: Drop python 3.7 and 3.8 (#763)

Feature releases are for using the newest python versions. This also eases maintenance

Security updates and bug fixes will be backported to https://github.com/tmux-python/tmuxp/tree/v1.10.x

libtmux: tmux-python/libtmux#363

Author: tony

.github/workflows/tests.yml

@@ -14,9 +14,9 @@ jobs:
         tmux-version: [ '2.6', '2.7', '2.8', '3.0a', '3.1b', '3.2a', 'master' ]
         # balance ci coverage across supported python/tmux versions with CI speed
         include:
-          - python-version: '3.7'
+          - python-version: '3.9'
             tmux-version: '2.6'
-          - python-version: '3.7'
+          - python-version: '3.9'
             tmux-version: 'master'
     steps:
     - uses: actions/checkout@v1

.python-version

@@ -1 +1 @@
-3.10.1 3.9.9 3.8.11 3.7.12
+3.10.1 3.9.9

.tool-versions

@@ -1,2 +1,2 @@
 poetry 1.1.12
-python 3.10.1 3.9.9 3.8.11 3.7.12
+python 3.10.1 3.9.9

CHANGES

@@ -24,6 +24,13 @@ $ pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force
 - {issue}`762`: CLI: Break up into modules in _cli.py_ -> _cli/{command}_
 - {issue}`761`: Refactor _tests/_ constants and fixtures
 
+### Compatibility
+
+- Python 3.7 and 3.8 support has been removed
+
+  Bug fixes and security updates will go to the
+  [`v1.10.x`](https://github.com/tmux-python/tmuxp/tree/v1.10.x) branch
+
 ## tmuxp 1.10.0 (2022-03-19)
 
 ### Compatibility

README.md

@@ -153,7 +153,7 @@ Window(@3 1:your_window, Session($1 your_project))
 Pane(%6 Window(@3 1:your_window, Session($1 your_project))
 ```
 
-Python 3.7+ supports [PEP
+Supports [PEP
 553](https://www.python.org/dev/peps/pep-0553/) `breakpoint()`
 (including `PYTHONBREAKPOINT`). Also supports direct commands via `-c`:
 
@@ -262,7 +262,7 @@ See donation options at <https://git-pull.com/support.html>.
 # Project details
 
 - tmux support: 1.8, 1.9a, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6
-- python support: >= 3.7, pypy, pypy3
+- python support: >= 3.9, pypy, pypy3
 - Source: <https://github.com/tmux-python/tmuxp>
 - Docs: <https://tmuxp.git-pull.com>
 - API: <https://tmuxp.git-pull.com/api.html>