Compare to imagemeta?

[mholt]

Hi -- I just found this repo and since it's focused on performance, I was wondering if you could add a benchmark comparing imagemeta as well. (I'm traveling currently or I'd just do it myself, but I'm also not familiar with your API yet.)

I know that lib is also under active development, so maybe there's room to share ideas and even consolidate if that would make sense.

[soypat]

Quite faster (x3) though it seems it is much more limited in what it can parse. I'll go ahead and talk to them to see if there's room for consolidation.

BenchmarkImageMeta_SmallImage-12      	  299059	      3823 ns/op	     921 B/op	       5 allocs/op
BenchmarkImageMeta_LargeImage-12      	  357704	      3400 ns/op	     929 B/op	       6 allocs/op