invoice_fiscal_position_update: Port to v8 and to new API
Merge pull request #19 from akretion/8.0

[ADD] account_invoice_force_number : Port to v8
Merge pull request #20 from alexis-via/8.0-port-fp-update

[MIG] Port invoice_fiscal_position_update to v8 and to new API
[FIX] README badge
Update README.md