change MPS api version

Author: error414

src/main/msp/msp_protocol.h

@@ -59,7 +59,7 @@
 #define MSP_PROTOCOL_VERSION                0   // Same version over MSPv1 & MSPv2 - message format didn't change and it backward compatible
 
 #define API_VERSION_MAJOR                   2   // increment when major changes are made
-#define API_VERSION_MINOR                   5   // increment when any change is made, reset to zero when major changes are released after changing API_VERSION_MAJOR
+#define API_VERSION_MINOR                   6   // increment when any change is made, reset to zero when major changes are released after changing API_VERSION_MAJOR
 
 #define API_VERSION_LENGTH                  2