kernel info to  txt_table.tpl

Hi Fboender,

First, thanks you for this great tool.

Could you please add the kernel info to txt_table? From my undarstanding custom only works with html. I have added manually but would be great to have this option by default. 

txt_table.tpl in cols: 

 {"title": "Kernel",     "id": "kernel",     "visible": True, "field": lambda h: host['ansible_facts'].get('ansible_kernel', '')},


