bug: -d conflict with dotnet

```
dotnet-version -d 1.2.0-beta.66
# Bumped version 1.2.0-beta.66
```

```
dotnet version -d 1.2.0-beta.66
# ERR You currently have uncomitted changes in your repository, please commit these and try again
```

## reason

dotnet

```
dotnet -h
```

> sdk-options:
>  -d|--diagnostics
>  -h|--help

## fix

use another char instead of `d`