Remove Python 2.7 stuff

Author: tony

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ '2.7', '3.x' ]
+        python-version: [ '3.x' ]
         tmux-version: [ '2.6', '2.7', '2.8', '3.0a', '3.1b', '3.2a', 'master' ]
     steps:
     - uses: actions/checkout@v1

README.rst

@@ -252,7 +252,7 @@ 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: 2.7, >= 3.3, pypy, pypy3
+- python support: >= 3.3, pypy, pypy3
 - Source: https://github.com/tmux-python/tmuxp
 - Docs: https://tmuxp.git-pull.com
 - API: https://tmuxp.git-pull.com/api.html

docs/plugin_system.rst

@@ -67,7 +67,7 @@ directory. The resulting file looks something like this:
     authors = ["Author Name <author.name@<domain>.com>"]
 
     [tool.poetry.dependencies]
-    python = "~2.7 || ^3.5"
+    python = "^3.5"
     tmuxp = "^1.6.0"
 
     [tool.poetry.dev-dependencies]