Follow the repository move from k0kubun to sqldef

Github returns an additional 302 to follow the repository move which
had made the downloading code broken.

Author: frsyuki

lib/sqldef.rb

@@ -130,7 +130,7 @@ def build_url(command)
       archive = OS_ARCHIVE.fetch(os)
       arch = Etc.uname.fetch(:machine)
       goarch = GOARCH.fetch(arch, arch)
-      "https://github.com/k0kubun/sqldef/releases/latest/download/#{command}_#{os}_#{goarch}.#{archive}"
+      "https://github.com/sqldef/sqldef/releases/latest/download/#{command}_#{os}_#{goarch}.#{archive}"
     end
 
     # TODO: Retry transient errors