Improve troubleshootings section in README.
Improve troubleshootings section in README.

Tiross/atoum,vonglasow/atoum,jubianchi/atoum,CedCannes/atoum,tejerka/atoum,tejerka/atoum,gpaton/atoum,CedCannes/atoum,Tiross/atoum,vonglasow/atoum,jubianchi/atoum,gpaton/atoum,GuillaumeDievart/atoum,mageekguy/atoum,agallou/atoum,mikaelrandy/atoum,GuillaumeDievart/atoum,mikaelrandy/atoum,mageekguy/atoum,agallou/atoum