enable possibility to end name with "/" for scoped packages

[dohomi]

This would be very helpful to still upgrade scoped packages like @scoped-name/ which currently fails:

manypkg upgrade @scoped-name/

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Latest commit: 5db57d7

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[dohomi]

Example:

manypkg upgrade @tamagui/

currently does not work.

manypkg upgrade @tamagui

works but it also upgrades @tamagui-extras which is not intended.

[emmatown]

Could you update this PR so that writing @scope in the CLI looks for packages starting with @scope/ rather than @scope? That was the original intent.

[Andarist]

Closed by #206