Update Mac installer Welcome and ReadMe files for 3.7.0a1
diff --git a/Mac/BuildScript/resources/Welcome.rtf b/Mac/BuildScript/resources/Welcome.rtf
index 3a9ab04..528e251 100644
--- a/Mac/BuildScript/resources/Welcome.rtf
+++ b/Mac/BuildScript/resources/Welcome.rtf
@@ -1,7 +1,7 @@
-{\rtf1\ansi\ansicpg1252\cocoartf1504
+{\rtf1\ansi\ansicpg1252\cocoartf1504\cocoasubrtf830
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
-{\*\expandedcolortbl;\csgray\c100000;}
+{\*\expandedcolortbl;;}
\paperw11905\paperh16837\margl1440\margr1440\vieww12200\viewh10880\viewkind0
\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\partightenfactor0
@@ -17,14 +17,12 @@
\b IDLE
\b0 .\
\
-\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\partightenfactor0
-\b \cf0 NEW:
-\b0 There are important changes in this release regarding network security and trust certificates. Please see the ReadMe for more details.\
+\b NOTE:
+\b0 This is an early developer preview of the next feature release of Python 3. Many features are yet to be added and existing features may change substantially or be deleted prior to the feature code freeze.\
\
-\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\partightenfactor0
-\b \cf0 IMPORTANT:
+\b IMPORTANT:
\b0
\b IDLE
\b0 and other programs using the