Update readme.md

Love now requires a newer CMake version, so this notice is not needed.

readme.md

@@ -25,7 +25,7 @@ To build just the dependencies for 64 bit x86 using Visual Studio 2019:
 
 	$ git clone https://github.com/love2d/megasource megasource
 	$ cd megasource
-	$ cmake -G "Visual Studio 16 2019" -A x64 -H. -Bbuild
+	$ cmake -G "Visual Studio 16 2019" -A x64 -S. -Bbuild
 	$ cmake --build build --target megatest --config Release
 
 ... or you can open the solution file in Visual Studio and build from there instead of invoking cmake --build.
@@ -34,14 +34,12 @@ To build for a different version of Visual Studio (or a different build tool), r
 
 Similarly, to build for a different architecture than 64 bit x86, use a different [architecture name][architectures] for the ```-A``` parameter.
 
-Note that ```-H``` has been replaced in CMake 3.13 with ```-S```.
-
 If you want to build [LÖVE][love2d], clone LÖVE into the *libs* folder. Megasource will automatically look for it there. E.g.:
 
 	$ git clone https://github.com/love2d/megasource megasource
 	$ cd megasource
 	$ git clone https://github.com/love2d/love libs/love
-	$ cmake -G "Visual Studio 16 2019" -A x64 -H. -Bbuild
+	$ cmake -G "Visual Studio 16 2019" -A x64 -S. -Bbuild
 	$ cmake --build build --target love/love --config Release
 
 The binaries can be found in *build/love/Release*.