Missing `examples/BENCHMARK.fz` file mentioned in README

[zaneenders]

Hi,

I downloaded and ran NumFuzz as the README instructed. Bumped into the following two errors.

dune exec -- nfuzz examples/BENCHMARK.fz

BENCHMARK.fz doesn't seem to exist anymore but dune exec -- nfuzz examples/NumFuzz/Horner2.fz seemed to compile and run correctly.

When running opam install --deps-only -d -t . I got the following error though it didn't seem to affect anything else from working.

[WARNING] Failed checks on nfuzz package definition from source at git+file:///Users/zane/Downloads/NumFuzz#main:
    error 22: Some fields are present but empty; remove or fill them: "homepage", "bug_reports"
Nothing to do.

Thanks,
Zane

[ak-2485]

Hello!

BENCHMARK.fz is used as a placeholder file name for the benchmark you'd like to run; i.e., you can type check a program in file FILENAME with the following command

dune exec -- nfuzz FILENAME

I'll keep this issue up so that I remember to fix the package warning! Thanks!