use bossac 1.9 as bossac1.8 for aarch64 #98
                
     Merged
            
            
          
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fix #95 tested on 64-bit pi OS (which will become more and more popular)
Since bossac 1.9 only has issue with macos and work well with linux. We will use bossac 1.9 binary as download link for 1.8 on aarch64 platform. In order to do this modification, we have to be the
packager, though it is just duplicated link from arduino. I would love make an PR to arduino index, but I don't think they would accept it since arduino didnt make use of the bossac18 at all.