Bump molecule from 5.1.0 to 6.0.0 #204

Job	Run time
Test role on different ansible versions (2.12, pdns-46)	3m 57s
Test role on different ansible versions (2.12, pdns-47)	3m 57s
Test role on different ansible versions (2.12, pdns-48)	4m 0s
Test role on different ansible versions (2.12, pdns-master)	3m 56s
Test role on different ansible versions (2.12, pdns-os-repos)	3m 59s
Test role on different ansible versions (2.12, systemd-no-overrides)	3m 52s
Test role on different ansible versions (2.13, pdns-46)	3m 56s
Test role on different ansible versions (2.13, pdns-47)	3m 58s
Test role on different ansible versions (2.13, pdns-48)	3m 56s
Test role on different ansible versions (2.13, pdns-master)	3m 57s
Test role on different ansible versions (2.13, pdns-os-repos)	3m 40s
Test role on different ansible versions (2.13, systemd-no-overrides)	3m 20s
Test role on different ansible versions (2.14, pdns-46)	3m 56s
Test role on different ansible versions (2.14, pdns-47)	3m 56s
Test role on different ansible versions (2.14, pdns-48)	3m 56s
Test role on different ansible versions (2.14, pdns-master)	3m 57s
Test role on different ansible versions (2.14, pdns-os-repos)	3m 57s
Test role on different ansible versions (2.14, systemd-no-overrides)	3m 55s
	1h 10m 5s

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