simplify CLI: clarify that handling '-t 22,25-30,35' is not required

Author: mvondracek

omega/README.md

@@ -43,6 +43,7 @@ where:
   * If `-i` is specified without a value (and any other parameters are unspecified), a list of active interfaces is printed to `stdout` and the program terminates with `0` exit code (additional information beyond the interface list is welcome but not required).
 * `-t` or `-u` specify scanned TCP/UDP port ranges.
   * Allowed examples: `-t 22`, `-u 1-65535`, `-t 22,23,24`. The `-u` and `-t` arguments can be specified separately, i.e. they do not have to occur both at once if the user wants only TCP or only UDP scanning.
+  * It is not required to handle combinations such as `-t 22,25-30,35`.
 * `-w 3000` is the timeout in milliseconds to wait for a response for a single port scan. This parameter is optional, in its absence the value 1000 (i.e., one second) is used.
 * _HOST_ which is either hostname (e.g., merlin.fit.vutbr.cz) or IPv4/IPv6 address of scanned device.
 * All arguments can be in any order.