Add version flag

[bgins]

Summary

This is currently implemented in the Haskell version of CLI, but not in the rewrite.

Problem

There needs to be a way to check what version of the CLI you are using.

Solution

Create a flag/command that lists the current version of the CLI in use

[BoisterousCoder]

This seems to already Exist in the code. The following line adds it. In order to test it, just run cargo run -- -V. I think this issue should be closed.

fission-cli/src/main.rs

Line 10 in 27ca6ef

#[clap(author, version, about="Fission makes developing, deploying, updating, and iterating on web apps quick and easy.", long_about = None)]