Update release notes for upcoming 1.4.1 version
Update release notes for upcoming 1.4.1 version

umrashrf/scrapy,dangra/scrapy,pawelmhm/scrapy,elacuesta/scrapy,finfish/scrapy,pablohoffman/scrapy,finfish/scrapy,dangra/scrapy,eLRuLL/scrapy,ssteo/scrapy,kmike/scrapy,finfish/scrapy,wujuguang/scrapy,starrify/scrapy,elacuesta/scrapy,Ryezhang/scrapy,pablohoffman/scrapy,elacuesta/scrapy,starrify/scrapy,dangra/scrapy,kmike/scrapy,eLRuLL/scrapy,ArturGaspar/scrapy,scrapy/scrapy,kmike/scrapy,ssteo/scrapy,ArturGaspar/scrapy,pawelmhm/scrapy,scrapy/scrapy,ArturGaspar/scrapy,Ryezhang/scrapy,pablohoffman/scrapy,Ryezhang/scrapy,ssteo/scrapy,umrashrf/scrapy,starrify/scrapy,umrashrf/scrapy,wujuguang/scrapy,pawelmhm/scrapy,eLRuLL/scrapy,wujuguang/scrapy,scrapy/scrapy