Bug#954133: python-acme build depends on python3-idna (< 2.8) but 2.8-1 is to be installed

[Adrian Bunk]

Source: python-acme
Version: 1.1.0-1
Severity: serious
Tags: ftbfs

The following packages have unmet dependencies:
 builddeps:python-acme : Depends: python3-idna (< 2.8) but 2.8-1 is to be 
installed