Document test coverage in contribution guide.
Document test coverage in contribution guide.

mikkokupsu/chronos,turb/chronos,hamo/chronos,hamo/chronos,solarkennedy/chronos,lionelnicolas/chronos,erSitzt/chronos,turb/chronos,Jimdo/chronos,hamo/chronos,mesos/chronos,Jimdo/chronos,solarkennedy/chronos,erSitzt/chronos,erSitzt/chronos,debugger87/chronos,motusllc/chronos,lionelnicolas/chronos,Jimdo/chronos,turb/chronos,vixns/chronos,mikkokupsu/chronos,mesos/chronos,motusllc/chronos,lionelnicolas/chronos,Jimdo/chronos,debugger87/chronos,vixns/chronos,erSitzt/chronos,motusllc/chronos,motusllc/chronos,vixns/chronos,lionelnicolas/chronos,mikkokupsu/chronos,solarkennedy/chronos,mikkokupsu/chronos,hamo/chronos,debugger87/chronos,solarkennedy/chronos,mesos/chronos,debugger87/chronos,vixns/chronos,mesos/chronos,turb/chronos