Update install.lua

Author: masx200

install.lua

@@ -57,7 +57,7 @@ function main()
     local listfile = path.join(downloadpath, folder .. '.list')
     if checkfilesexists(listfile) then return end
     if not os.exists(archivefile) then
-        local url = 'https://ghp.ci//https://github.com/masx200/' ..
+        local url = 'https://ghp.ci/https://github.com/masx200/' ..
                         name .. '/archive/' .. version .. '.zip'
         print('download url:' .. url .. " to file:" .. archivefile)
         download(url, archivefile)