make BrotliSharpLib .netstandard2.0 compatible

[ksysiekj]

i'm using BrotliSharpLib on my project (rest api) targeting .net461 and it works ok. however, I've ported my project to .netstandard2.0 (netcoreapp2.1) and it seems not to be working correctly - serialization of 7000 objects (each of them has 10 string properties) takes approx. 15-16 secs and my endpoint responds in 20sec instead of 3.
Can you please make BrotliSharpLib .netstandard2.0 compatible or investigate what may cause the delay - taking 15secs to serialize 7000 objects doesn't seem to be right?

[master131]

Have you tried adjusting the quality value? The default was 11. I have adjusted it now so that it's 1 by default.