Make base types `object of RootObj`
Make base types `object of RootObj`

Thanks to @jyapayne for noticing this in #29!
tmm1/nim-by-example,tmm1/nim-by-example,zhjh1209/nim-by-example.github.io,tmm1/nim-by-example,zhjh1209/nim-by-example.github.io,flaviut/nim-by-example,flaviut/nim-by-example,flaviut/nim-by-example,tmm1/nim-by-example,flaviut/nim-by-example