message: update fuzzer description
diff: @@ -58,6 +58,10 @@ then the following executables will be compiled:
  provided, the default format is VPack.
  * `--json`: generate JSON structures. If neither this option or `--vpack` is
  provided, the default format is VPack.
  + * `--evil`: edit the generated valid byte sequences with byte insertions,
  + removals or overwrites. Can be used to simulate attacks with malicious
  + inputs.
  * `--iterations`: number of iterations that will be run. Default is 1.
  * `--threads`: number of threads for parallelization. Default is 1.
  - * `--seed`: number that will be used as seed for random generation.
  + * `--seed`: number that will be used as seed for random generation (to make
  + fuzzer runs repeatable if necessary).
  