Update changelog for upcoming 1.2.2 release
Update changelog for upcoming 1.2.2 release

w495/scrapy,elacuesta/scrapy,rolando/scrapy,foromer4/scrapy,crasker/scrapy,starrify/scrapy,w495/scrapy,pablohoffman/scrapy,ArturGaspar/scrapy,pablohoffman/scrapy,pawelmhm/scrapy,Ryezhang/scrapy,pawelmhm/scrapy,rootAvish/scrapy,taito/scrapy,umrashrf/scrapy,umrashrf/scrapy,starrify/scrapy,kmike/scrapy,foromer4/scrapy,rolando-contrib/scrapy,rolando/scrapy,pawelmhm/scrapy,dangra/scrapy,arush0311/scrapy,crasker/scrapy,ssteo/scrapy,finfish/scrapy,darkrho/scrapy-scrapy,finfish/scrapy,shaform/scrapy,scrapy/scrapy,dangra/scrapy,pablohoffman/scrapy,eLRuLL/scrapy,kmike/scrapy,rootAvish/scrapy,elacuesta/scrapy,Parlin-Galanodel/scrapy,eLRuLL/scrapy,rootAvish/scrapy,ArturGaspar/scrapy,arush0311/scrapy,Ryezhang/scrapy,finfish/scrapy,ArturGaspar/scrapy,scrapy/scrapy,kmike/scrapy,crasker/scrapy,Parlin-Galanodel/scrapy,shaform/scrapy,dangra/scrapy,Ryezhang/scrapy,wujuguang/scrapy,darkrho/scrapy-scrapy,wujuguang/scrapy,ssteo/scrapy,rolando-contrib/scrapy,foromer4/scrapy,starrify/scrapy,Parlin-Galanodel/scrapy,arush0311/scrapy,darkrho/scrapy-scrapy,umrashrf/scrapy,taito/scrapy,shaform/scrapy,elacuesta/scrapy,taito/scrapy,w495/scrapy,scrapy/scrapy,rolando-contrib/scrapy,eLRuLL/scrapy,wujuguang/scrapy,ssteo/scrapy,rolando/scrapy