Add support for CPython 3.8.5 (#996)

https://www.python.org/downloads/release/python-385/

Release contains a couple of security bugfixes.
Changelog: https://docs.python.org/release/3.8.5/whatsnew/changelog.html#changelog

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 # Master
 
+- Python 3.8.5 is now available (CPython)
 
 # 172 (2020-07-17)
 

README.md

@@ -62,7 +62,7 @@ Specify a Python Runtime
 
 Supported runtime options include:
 
-- `python-3.8.4`
+- `python-3.8.5`
 - `python-3.7.8`
 - `python-3.6.11`
 - `python-2.7.18`

bin/default_pythons

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 DEFAULT_PYTHON_VERSION="python-3.6.11"
-LATEST_38="python-3.8.4"
+LATEST_38="python-3.8.5"
 LATEST_37="python-3.7.8"
 LATEST_36="python-3.6.11"
 LATEST_35="python-3.5.9"

builds/runtimes/python-3.8.5

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3