Fixed Readme.md
Fixed Readme.md

There was redundant symbol which can lead to error in newbies.
pprados/gekko,BarnumD/gekko,generalectric/gekko,WXLWEB/gekko,generalectric/gekko,askmike/gekko,pprados/gekko,pprados/gekko,nourchawich/gekko,nourchawich/gekko,BarnumD/gekko,generalectric/gekko,WXLWEB/gekko,askmike/gekko,WXLWEB/gekko,askmike/gekko,BarnumD/gekko,nourchawich/gekko