Increase version to 6.7.20 and update Readme

Author: astrogeco

README.md

@@ -8,6 +8,11 @@ This is a collection of services and associated framework to be located in the `
 
 ## Version History
 
+### Development Build: 6.7.20
+
+-  SB Unit use of the UT assert framework is closer to original design intent
+- See <https://github.com/nasa/cFE/pull/743>
+
 ### Development Build: 6.7.19
 
 - API Change: cFE ut_sb_stubs now has CFE_SB_DeletePipe available.

fsw/cfe-core/src/inc/cfe_version.h

@@ -95,7 +95,7 @@
 */
 #define CFE_MAJOR_VERSION         6
 #define CFE_MINOR_VERSION         7
-#define CFE_REVISION              19
+#define CFE_REVISION              20
 
 
 #endif  /* _cfe_version_ */