Use binary literals for xor chunk encoding
Use binary literals for xor chunk encoding

An opinionated cosmetic change, but since go 1.13 we have this fancy
0b.... literals so we don't need to write hex and comment the binary
value.

Signed-off-by: Oleg Zaytsev <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@olegzaytsev.com>

alileza/prometheus,alileza/prometheus,prometheus/prometheus,keegancsmith/prometheus,prometheus/prometheus,prometheus/prometheus,alileza/prometheus,prometheus/prometheus,keegancsmith/prometheus,alileza/prometheus,alileza/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,keegancsmith/prometheus