Fix missing ignore type in config

[byCedric]

From the docs I understand that this should be there. I assume it uses the same type as the files property, one or more globs.

• Ignore a single file or glob
• Ignore multiple files or globs

[coveralls]

Coverage remained the same at 100.0% when pulling 35d7a6a on byCedric:patch-1 into 71dba0e on adamreisnz:master.