`swiftly run -h` doesn't provide run command help

[jerryjrchen]

Very similar to #218, except this is for the short version of the help flag.

$ swiftly run -h
/usr/bin/env: illegal option -- h
usage: env [-0iv] [-C workdir] [-P utilpath] [-S string]
           [-u name] [name=value ...] [utility [argument ...]]

According to swiftly, the short flag should be supported:

$ swiftly run --help

<output elided>

OPTIONS:
  --version               Show the version.
  -h, --help              Show help information.

Note both -h, --help are available there.