Updating next release version to be v2.9.1

Author: arobenko

CMakeLists.txt

@@ -32,7 +32,7 @@ option (MQTTSN_BUILD_EMSCRIPTEN "Build and install project generated by the comm
 # COMMSDSL2SWIG_EXTRA_ARGS - Extra arguments to pass to "commsdsl2swig"
 # COMMSDSL2EMSCRIPTEN_EXTRA_ARGS - Extra arguments to pass to "commsdsl2emscripten"
 
-set (MQTTSN_VERSION "2.9")
+set (MQTTSN_VERSION "2.9.1")
 set (MQTTSN_MIN_COMMSDSL_VERSION "6.3.4")
 
 if ("${CMAKE_CXX_STANDARD}" STREQUAL "")