Update 'README.md'

README.md

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 cgminer-gekko OpenWRT builder (work in progress)
 
-For mr3020 , wr703n , rpi , rpi2 => install ubuntu 16.04
-For mr3040 , wr802n , rpi3 => install ubuntu 20.04
+* For mr3020 , wr703n , rpi , rpi2 => install ubuntu 16.04
+* For mr3040 , wr802n , rpi3 => install ubuntu 20.04
 
 
 open terminal