Tasks type itself isn't accepted suite

[jannek76]

Following suite gives error

W: 4, 0: Unknown table name 'Tasks' (InvalidTableInResource)

*** Settings ***
Documentation  Task Documentation

*** Tasks ***
Testing Task
  No Operation

This should be accepted since RF 3.1.

Tested with configurations:

Python 3.8.5
robotframework==3.2.2
robotframework-lint==1.1 

and

Python 3.8.5
robotframework==4.0.1
robotframework-lint==1.1

Rflint accept *** Tasks *** type if *** Test Cases *** is also defined in suite

[forceedge01]

I've had the same issue, raised a pull request on this #93 if @boakley could accept, merge and release that be ace.