Drop support for Python 3.7 (#117)

Python 3.7 has been end-of-life for a while, see https://devguide.python.org/versions/

Also allow to manually launch the test workflow from Github UI.

.github/workflows/buildwheels.yml

@@ -56,7 +56,7 @@ jobs:
         env:
           CIBW_TEST_REQUIRES: hypothesis
           CIBW_TEST_COMMAND: "python {project}/test.py -v && python {project}/cydoctest.py -v"
-          CIBW_SKIP: "pp* cp36-*"
+          CIBW_SKIP: "pp* cp36-* cp37-*"
           CIBW_ARCHS: ${{ matrix.cibw_archs }}
           CIBW_TEST_SKIP: "*-win_arm64"
           CIBW_BUILD_FRONTEND: "build"

.github/workflows/test.yml

@@ -1,6 +1,6 @@
 name: Tests
 
-on: [push,pull_request]
+on: [push,pull_request,workflow_dispatch]
 
 jobs:
     build:
@@ -9,7 +9,7 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest, macos-latest, windows-latest]
-                python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+                python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
         steps:
             - name: Set up the repository
               uses: actions/checkout@v3

README.rst

@@ -36,7 +36,7 @@ Output:
 Installation from Pypi
 ----------------------
 
-Supported systems: Linux, MacOS or Windows, Python 3.7 or higher. Note that pyroaring might still work with older Python
+Supported systems: Linux, MacOS or Windows, Python 3.8 or higher. Note that pyroaring might still work with older Python
 versions, but they are not tested anymore.
 
 To install pyroaring on your local account, use the following command:

setup.py

@@ -99,7 +99,6 @@
         'Operating System :: POSIX :: Linux',
         'Operating System :: MacOS :: MacOS X',
         'Operating System :: Microsoft :: Windows',
-        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',