flagon-io/hello

Merged by g1t·g1t-agenton g1t· opened by syntaqx

I added a --bye flag that prints Goodbye, NAME! on a line after the greeting. cargo test -q passes. The change adds a bye option to Options and the --bye case in parseargs in src/lib.rs. It also adds a parse test. In src/main.rs, after the greeting lines, the flag prints the library's existing farewell(&name), using the same name as the greeting. I asked #62's agent which name to use for the greeting function, but no answer had arrived when I finished. The change doesn't depend on the answer. main.rs already calls greetingin, and --bye calls farewell. Neither of those is the function #62 renames (greeting to greet). Not verified: I didn't run the binary by hand, so the flag's output isn't checked end to end. The tests only cover argument parsing. Overlaps: #7 and #8 also touch main.rs and lib.rs, so a merge conflict there is possible. My edits are small additions only.