Add note to Mac installer ReadMe about macOS 10.15 Gatekeeper changes. (GH-18647)

diff --git a/Mac/BuildScript/resources/ReadMe.rtf b/Mac/BuildScript/resources/ReadMe.rtf
index d321fcd80c2eb8b06015083a2161c9d563305e7c..4cb0111d83a530a4caa589d1a9707fe3d59fe6a1 100644 (file)
--- a/Mac/BuildScript/resources/ReadMe.rtf
+++ b/Mac/BuildScript/resources/ReadMe.rtf
@@ -1,5 +1,5 @@
-{\rtf1\ansi\ansicpg1252\cocoartf1671\cocoasubrtf600
-{\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\fswiss\fcharset0 Helvetica-Bold;\f2\fswiss\fcharset0 Helvetica-Oblique;
+{\rtf1\ansi\ansicpg1252\cocoartf2511
+\cocoatextscaling0\cocoaplatform0{\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\fswiss\fcharset0 Helvetica-Bold;\f2\fswiss\fcharset0 Helvetica-Oblique;
 \f3\fmodern\fcharset0 CourierNewPSMT;}
 {\colortbl;\red255\green255\blue255;}
 {\*\expandedcolortbl;;}
@@ -36,8 +36,7 @@ The bundled
 \f0\b0 \ulnone \
 \
 This package includes its own private version of Tcl/Tk 8.6. It does not use any system-supplied or third-party supplied versions of Tcl/Tk.\
-\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
-\cf0 \
+\
 Due to new security checks on macOS 10.15 Catalina, when launching IDLE macOS may open a window with a message 
 \f1\b "Python" would like to access files in your Documents folder
 \f0\b0 .  This is normal as IDLE uses your 
@@ -49,9 +48,14 @@ Due to new security checks on macOS 10.15 Catalina, when launching IDLE macOS ma
 \f0\b0  file dialog windows.  Click on the 
 \f1\b OK
 \f0\b0  button to proceed.\
-\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
 
-\f1\b \cf0 \ul \ulc0 \
+\f1\b \ul \
+macOS 10.15 (Catalina) Gatekeeper Requirements [changed in 3.8.2]\
+
+\f0\b0 \ulnone \
+As of 2020-02-03, Apple has changed how third-party installer packages, like those provided by python.org, are notarized for verification by Gatekeeper and begun enforcing additional requirements such as code signing and use of the hardened runtime.  As of 3.8.2, python.org installer packages now meet those additional notarization requirements.  The necessary changes in packaging should be transparent to your use of Python but, in the unlikely event that you encounter changes in behavior between 3.8.1 and 3.8.2 in areas like ctypes, importlib, or mmap, please check bugs.python.org for existing reports and, if necessary, open a new issue.\
+
+\f1\b \ul \
 Other changes\
 
 \f0\b0 \ulnone \