Add a unit as last argument

[davesnx]

This PR fixes #142

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[github-actions]

New nightly version has been published to the NPM registry: @davesnx/styled-ppx@0.24.2-652c905.0.
Install it with npm install @davesnx/styled-ppx@nightly or npm install @davesnx/styled-ppx@0.24.2-652c905.0.

[github-actions]

New nightly version has been published to the NPM registry: @davesnx/styled-ppx@0.24.2-71e49bb.0.
Install it with npm install @davesnx/styled-ppx@nightly or npm install @davesnx/styled-ppx@0.24.2-71e49bb.0.

[github-actions]

New nightly version has been published to the NPM registry: @davesnx/styled-ppx@.
Install it with npm install @davesnx/styled-ppx@nightly or npm install @davesnx/styled-ppx@.