CI: Drop Python 3.5 support

Author: datapythonista

ci/azure/posix.yml

@@ -9,17 +9,12 @@ jobs:
   strategy:
     matrix:
       ${{ if eq(parameters.name, 'macOS') }}:
-        py35_macos:
-          ENV_FILE: ci/deps/azure-macos-35.yaml
-          CONDA_PY: "35"
+        py36_macos:
+          ENV_FILE: ci/deps/azure-macos-36.yaml
+          CONDA_PY: "36"
           PATTERN: "not slow and not network"
 
       ${{ if eq(parameters.name, 'Linux') }}:
-        py35_compat:
-          ENV_FILE: ci/deps/azure-35-compat.yaml
-          CONDA_PY: "35"
-          PATTERN: "not slow and not network"
-
         py36_locale_slow_old_np:
           ENV_FILE: ci/deps/azure-36-locale.yaml
           CONDA_PY: "36"

ci/deps/azure-35-compat.yaml

@@ -223,7 +223,6 @@ def build_extensions(self):
     "Intended Audience :: Science/Research",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.5",
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
@@ -817,7 +816,7 @@ def srcpath(name=None, suffix=".pyx", subdir="src"):
     long_description=LONG_DESCRIPTION,
     classifiers=CLASSIFIERS,
     platforms="any",
-    python_requires=">=3.5.3",
+    python_requires=">=3.6",
     extras_require={
         "test": [
             # sync with setup.cfg minversion & install.rst