setup.py + CI: Remove support for Python 3.4 and 3.5

.github/workflows/test.yml

@@ -10,23 +10,15 @@ jobs:
     runs-on: ${{ matrix.runs-on }}
     strategy:
       matrix:
-        python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11.0-alpha.2", "pypy-3.6", "pypy-3.7"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11.0-alpha.2", "pypy-3.6", "pypy-3.7"]
         with-opt-deps: [false, true]
         runs-on: [ubuntu-latest]
         exclude:
           # Some of the dependencies don't work on old Python versions
-          - python-version: "3.4"
-            with-opt-deps: true
-          - python-version: "3.5"
-            with-opt-deps: true
           - python-version: "3.6"
             with-opt-deps: true
           - python-version: "pypy-3.6"
             with-opt-deps: true
-        include:
-          - python-version: "3.4"
-            with-opt-deps: false
-            runs-on: ubuntu-18.04
 
     steps:
       - uses: actions/checkout@v2

setup.py

@@ -106,21 +106,11 @@ if version:
     fd.write('    pass\n')
     fd.close()
 
-if sys.version_info < (3, 4, 0):
+if sys.version_info < (3, 6, 0):
     sys.stderr.write("Limnoria requires Python 3.6 or newer.")
     sys.stderr.write(os.linesep)
     sys.exit(-1)
 
-if sys.version_info < (3, 6, 0) \
-        and os.environ.get('LIMNORIA_WARN_OLD_PYTHON') != '0':
-    sys.stderr.write('====================================================\n')
-    sys.stderr.write('Limnoria support for Python versions older than 3.6\n')
-    sys.stderr.write('is deprecated and may be removed in the near future.\n')
-    sys.stderr.write('You should upgrade ASAP.\n')
-    sys.stderr.write('Install will continue in 60s.\n')
-    sys.stderr.write('====================================================\n')
-    time.sleep(60)
-
 plugins = [s for s in os.listdir('plugins') if
            os.path.exists(os.path.join('plugins', s, 'plugin.py'))]