Update read-me to refer to Delphi 10.4 as latest supported compiler

Author: delphidabbler

Docs/ReadMe.txt

@@ -14,7 +14,7 @@ online DelphiDabbler Code Snippets database as well as maintain a database of
 user-defined snippets.
 
 It displays details of each snippet in the database and can test-compile them
-with each installed Win32 version of Delphi from Delphi 2 to Delphi 10.1 Berlin
+with each installed Win32 version of Delphi from Delphi 2 to Delphi 10.4 Sydney
 and Free Pascal.
 
 Compilable Pascal units can be created that contain selected snippets.
@@ -201,7 +201,7 @@ Configuring CodeSnip to Work With Your Compilers
 ================================================================================
 
 A feature of CodeSnip is its ability to test compile snippets with any installed
-Windows 32 version of Delphi (from Delphi 2 to Delphi 10.1 Berlin) and
+Windows 32 version of Delphi (from Delphi 2 to Delphi 10.4 Sydney) and
 FreePascal, providing some simple rules are followed.
 
 When CodeSnip is first installed it knows nothing about the available compilers
@@ -218,7 +218,7 @@ dialogue" in the help file index).
 
 Each user can configure compilers differently.
 
-Delphi XE2 to XE8 and Delphi 10.1 Berlin may need to be configured to search for
+Delphi XE2 to XE8 and Delphi 10.4 Sydney may need to be configured to search for
 required units in the correct namespaces. This is explained in the Add/Edit
 Snippet Dialogue Box help topic and in the FAQ at
 https://github.com/delphidabbler/codesnip-faq/blob/master/UsingCodeSnip.md#faq-1