* Add support for `help` parameter in *CLI arguments*:
* As `help` in *CLI arguments* is not supported by Click, there are two new internal classes (Click sub-classes) to support it:
* `typer.core.TyperArgument`
* `typer.core.TyperCommand`
* This includes a new auto-generated help text section `Arguments` for *CLI arguments*, showing defaults, required arguments, etc.
* It's also possible to disable it and keep the previous behavior, not showing automatic help for *CLI arguments* (Click's default) using the `hidden` parameter.
* Now `show_default` is `True` by default.
* And now `show_envvar` is `True` by default.
* So, default values and env vars are shown in the help text by default, without having to manually enable them, for both *CLI arguments* and *CLI options*.
* New docs:
* [CLI Arguments Intro](https://typer.tiangolo.com/tutorial/arguments/).
* [Optional CLI Arguments](https://typer.tiangolo.com/tutorial/arguments/optional/).
* [CLI Arguments with Default](https://typer.tiangolo.com/tutorial/arguments/default/).
* [CLI Arguments with Help](https://typer.tiangolo.com/tutorial/arguments/help/).
* [CLI Arguments with Environment Variables](https://typer.tiangolo.com/tutorial/arguments/envvar/).
* [CLI Arguments: Other uses](https://typer.tiangolo.com/tutorial/arguments/other-uses/).
* [CLI arguments with tuples](https://typer.tiangolo.com/tutorial/multiple-values/arguments-with-multiple-values/#cli-arguments-with-tuples).
* Lot's of tests for all the new examples in the new docs, keeping coverage at 100%.
* PR [123](https://github.com/tiangolo/typer/pull/123).
* Add docs for calling packages with `python -m some_package` using `__main__.py`: [Building a Package: Support `python -m`](https://typer.tiangolo.com/tutorial/package/#support-python-m-optional). PR [121](https://github.com/tiangolo/typer/pull/121).
* Add support for `*args` and `**kwargs` when calling the Typer app, just like in Click. PR [120](https://github.com/tiangolo/typer/pull/120) by [teymour-aldridge](https://github.com/teymour-aldridge).
* Fix typos in README and main docs [103](https://github.com/tiangolo/typer/pull/103) by [mrcartoonster](https://github.com/mrcartoonster).
* Fix typo in docs. PR [98](https://github.com/tiangolo/typer/pull/98) by [mrcartoonster](https://github.com/mrcartoonster).
* Fix typos and rewording in docs. PR [97](https://github.com/tiangolo/typer/pull/97) by [mrcartoonster](https://github.com/mrcartoonster).
* Update GitHub Action issue-manager. PR [114](https://github.com/tiangolo/typer/pull/114).