Backport PR pandas-dev#28982: Document 3.8 compatibility

Author: TomAugspurger

doc/source/install.rst

@@ -18,7 +18,7 @@ Instructions for installing from source,
 Python version support
 ----------------------
 
-Officially Python 3.5.3 and above, 3.6, and 3.7.
+Officially Python 3.5.3 and above, 3.6, 3.7, and 3.8.
 
 Installing pandas
 -----------------

doc/source/whatsnew/v0.25.2.rst

@@ -6,6 +6,10 @@ What's new in 0.25.2 (October XX, 2019)
 These are the changes in pandas 0.25.2. See :ref:`release` for a full changelog
 including other versions of pandas.
 
+.. note::
+
+    Pandas 0.25.2 adds compatibility for Python 3.8 (:issue:`28147`).
+
 .. _whatsnew_0252.bug_fixes:
 
 Bug fixes

setup.py

@@ -230,6 +230,7 @@ def build_extensions(self):
     "Programming Language :: Python :: 3.5",
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
     "Programming Language :: Cython",
     "Topic :: Scientific/Engineering",
 ]