Argument descriptions

This version implement the support for argument descriptions.

Examples

before 0.7.1 still suppported

@command(description="Add two numbers!")
async def add(
        first: int,
        second: int
):
    return f"The addition of `{first}` and `{second}` is `{first + second}`"

argument descriptions

@command(description="Add two numbers!")
async def add(
        first: (int, "The first number"),
        second: (int, "The second number")
):
    return f"The addition of `{first}` and `{second}` is `{first + second}`"

Result within discord