Declare compliance with Debian Policy 4.7.0

Author: Lucas Kanashiro

debian/control

@@ -23,7 +23,7 @@ Build-Depends: bison,
                systemtap-sdt-dev [linux-any],
                tzdata,
                zlib1g-dev
-Standards-Version: 4.5.1
+Standards-Version: 4.7.0
 Homepage: https://www.ruby-lang.org/
 Vcs-Git: https://github.com/sorah-rbpkg/ruby
 Vcs-Browser: https://github.com/sorah-rbpkg/ruby