Update rdoc dependency to version 3.8
Update rdoc dependency to version 3.8

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