cmake readme: fix equal sign

Author: 0xc0170

cmake/README.md

@@ -1,6 +1,6 @@
 ## CMake for Mbed OS
 
-Until further notice, CMake for Mbed OS is still in the development.  
+Until further notice, CMake for Mbed OS is still in the development. 
 
 ### Supported targets
 
@@ -29,8 +29,8 @@ Supported examples can be identified by the presence of a top level `CMakelists.
 ## How to build an application
 
 Prerequisities:
-- CMake >3.18.2
-- mbed-tools >3.2.0
+- CMake >=3.18.2
+- mbed-tools >=3.2.0
 
 From the application root run the following:
 1. To create Mbed OS configuration: `mbedtools configure -m target_name -t toolchain_name`