Update readme

Author: weltling

README.md

@@ -12,14 +12,14 @@ The PHP SDK 2.0+ is compatible with PHP 7.0 and above. The compatibility with [o
 
 # Requirements
 
-- `Visual C++ 2015` or `Visual C++ 2017` must be installed prior SDK usage (be sure to install both the C++ and the Windows SDK components)
+- A 64-bit build host
+- `Visual C++ 2015` or `Visual C++ 2017` must be installed prior SDK usage (be sure to install the C++ dev, .NET dev and the Windows SDK components)
 - if `Cygwin`, `MingW` or any other cross solution is installed, please read notes in the pitfalls section
-- if a 64-bit build is intended, a 64-bit system is required. Cross compilation of 64-bit on 32-bit system is not supported at the moment
 - The PHP SDK was successfully tested on Windows 7 or later, earlier versions might work but are not recommended
 
 # Tools
 
-All the tools included are either scripts or 32-bit binaries. They are therefore runable on any of x86 or x64 supported Windows system.
+All the tools included are either scripts or binaries. They are therefore runable on any of x86 or x64 supported Windows system.
 
 ## SDK