Check for positional arguments

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6c7083a) 97.70% compared to head (e35ae69) 97.70%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.x #103 +/- ## ======================================= Coverage 97.70% 97.70% ======================================= Files 24 24 Lines 1440 1440 ======================================= Hits 1407 1407 Misses 33 33 ``` | [Files Changed](https://app.codecov.io/gh/andrey-zherikov/argparse/pull/103?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrey+Zherikov) | Coverage Δ | | |---|---|---| | [source/argparse/internal/argumentuda.d](https://app.codecov.io/gh/andrey-zherikov/argparse/pull/103?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrey+Zherikov#diff-c291cmNlL2FyZ3BhcnNlL2ludGVybmFsL2FyZ3VtZW50dWRhLmQ=) | `97.01% <ø> (ø)` | | | [source/argparse/internal/command.d](https://app.codecov.io/gh/andrey-zherikov/argparse/pull/103?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrey+Zherikov#diff-c291cmNlL2FyZ3BhcnNlL2ludGVybmFsL2NvbW1hbmQuZA==) | `97.29% <ø> (ø)` | | | [source/argparse/package.d](https://app.codecov.io/gh/andrey-zherikov/argparse/pull/103?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrey+Zherikov#diff-c291cmNlL2FyZ3BhcnNlL3BhY2thZ2UuZA==) | `99.36% <ø> (ø)` | |

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