Edit presets/README.md

[maro-21]

I've noticed some broken links in the file.

Because you renamed the branch master, it should be fixed in two places:

• Upon merging with master
• * [iD's spritesheet](https://github.com/openstreetmap/iD/tree/master/svg/iD-sprite/presets)

And

• Link to Maki works, but it's a redirection
• Link to Temaki doesn't work: 404

[quincylvania]

@maro-21 Thanks, these have already been changed in the develop and release branches. Did you follow a link that needs updating?

[maro-21]

Oops, it looks like I saw an old version, sorry :)