chore(deps): update pos

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
odoo12-addon-pos-invoice-send-mail	==12.0.1.0.0.99.dev15 -> ==12.0.1.0.0.99.dev16
odoo12-addon-pos-mail-receipt	==12.0.1.0.0.99.dev14 -> ==12.0.1.0.0.99.dev15

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