Dependency requirement updates: requests 2.4.0 or above (refs: #3268, #3310)

CHANGES

@@ -1,6 +1,11 @@
 Release 1.5.2 (in development)
 ===============================
 
+Incompatible changes
+--------------------
+
+* Dependency requirement updates: requests 2.4.0 or above (refs: #3268, #3310)
+
 Features added
 --------------
 

setup.py

@@ -50,7 +50,7 @@ requires = [
     'babel>=1.3,!=2.0',
     'alabaster>=0.7,<0.8',
     'imagesize',
-    'requests',
+    'requests>=2.4.0',
 ]
 extras_require = {
     # Environment Marker works for wheel 0.24 or later