Update simple_cov dependency to version 0.6.4
Update simple_cov dependency to version 0.6.4

akintoey/adopt-a-hydrant,code4sac/adopt-a-light,openshift-quickstart/adopt-a-hydrant-openshift-quickstart,CostantinB/adopt-a-hydrant,eebbesen/adopt-a-tree,eebbesen/adopt-a-tree,0111001101111010/adopt-a-spot-odu,HackMichiana/adopt-a-bus-stop,codeforanchorage/adopt-a-hydrant,Bryanprz/adopt-a-street,baraka101/dar-adopt-a-mtaro,jasnow/adopt-a-hydrant,eebbesen/adopt-a-tree,jamiekelly/adopt-a-hydrant,codefornigeria/adopt-a-hydrant,OpenTwinCities/adopt-a-tree,codeforsavannah/adopt-a-garden,codeforamerica/adopt-a-hydrant,baraka101/dar-adopt-a-mtaro,t-pfaff/adopt-a-hydrant,jamiekelly/adopt-a-hydrant,billyfung/van-racks,akintoey/adopt-a-hydrant,HackMichiana/adopt-a-bus-stop,Stackato-Apps/adopt-a-hydrant,billyfung/van-racks,t-pfaff/adopt-a-hydrant,friendlycode/adopt-a-hydrant,Stackato-Apps/adopt-a-hydrant,Bryanprz/adopt-a-street,codefornigeria/adopt-a-hydrant,voyera/adopt-a-hydrant,jasnow/adopt-a-hydrant,OpenTwinCities/adopt-a-tree,codeforanchorage/adopt-a-hydrant,codeforboston/adopt-a-hydrant,voyera/adopt-a-hydrant,jasnow/adopt-a-hydrant,codeforamerica/adopt-a-hydrant,codeforsavannah/adopt-a-garden,openshift-quickstart/adopt-a-hydrant-openshift-quickstart,codeforboston/adopt-a-hydrant,akintoey/adopt-a-hydrant,voyera/adopt-a-hydrant,codefornigeria/adopt-a-hydrant,billyfung/van-racks,t-pfaff/adopt-a-hydrant,OpenTwinCities/adopt-a-tree,code4sac/adopt-a-light,baraka101/dar-adopt-a-mtaro,0111001101111010/adopt-a-spot-odu,codeforamerica/adopt-a-hydrant,CostantinB/adopt-a-hydrant,Bryanprz/adopt-a-street,Stackato-Apps/adopt-a-hydrant,CostantinB/adopt-a-hydrant,jamiekelly/adopt-a-hydrant,friendlycode/adopt-a-hydrant,openshift-quickstart/adopt-a-hydrant-openshift-quickstart,friendlycode/adopt-a-hydrant,OpenTwinCities/adopt-a-tree