[httpcompression] add brotlipy for python 3
[httpcompression] add brotlipy for python 3

eLRuLL/scrapy,wujuguang/scrapy,wujuguang/scrapy,kmike/scrapy,shaform/scrapy,rolando-contrib/scrapy,dangra/scrapy,umrashrf/scrapy,elacuesta/scrapy,pawelmhm/scrapy,umrashrf/scrapy,scrapy/scrapy,ArturGaspar/scrapy,eLRuLL/scrapy,starrify/scrapy,darkrho/scrapy-scrapy,finfish/scrapy,taito/scrapy,scrapy/scrapy,dangra/scrapy,ssteo/scrapy,ssteo/scrapy,ArturGaspar/scrapy,kmike/scrapy,finfish/scrapy,dangra/scrapy,ArturGaspar/scrapy,pawelmhm/scrapy,pawelmhm/scrapy,Parlin-Galanodel/scrapy,pablohoffman/scrapy,kmike/scrapy,elacuesta/scrapy,rolando-contrib/scrapy,pablohoffman/scrapy,shaform/scrapy,Ryezhang/scrapy,shaform/scrapy,elacuesta/scrapy,starrify/scrapy,ssteo/scrapy,darkrho/scrapy-scrapy,Ryezhang/scrapy,Parlin-Galanodel/scrapy,finfish/scrapy,rolando/scrapy,taito/scrapy,rolando/scrapy,rolando/scrapy,umrashrf/scrapy,starrify/scrapy,Parlin-Galanodel/scrapy,Ryezhang/scrapy,pablohoffman/scrapy,darkrho/scrapy-scrapy,eLRuLL/scrapy,wujuguang/scrapy,scrapy/scrapy,rolando-contrib/scrapy,taito/scrapy