Clean-up pack description after release

Author: VladimirUmek

ARM.CMSIS-Compiler.pdsc

@@ -13,12 +13,8 @@
   <repository type="git">https://github.com/ARM-software/CMSIS-Compiler.git</repository>
 
   <releases>
-    <release version="2.2.1-dev">
+    <release version="2.3.1-dev">
       Active Development ...
-      CLANG:
-      - Added standard I/O stream support for LLVM-libc
-      I/O Retarget:
-      - Added reargeting to RTT
     </release>
   </releases>