CMake 3.18.0-rc4

Source/CMakeVersion.cmake

@@ -2,7 +2,7 @@
 set(CMake_VERSION_MAJOR 3)
 set(CMake_VERSION_MINOR 18)
 set(CMake_VERSION_PATCH 0)
-set(CMake_VERSION_RC 3)
+set(CMake_VERSION_RC 4)
 set(CMake_VERSION_IS_DIRTY 0)
 
 # Start with the full version number used in tags.  It has no dev info.