Copy 2.6.3 release notes from the 2.6 branch
Copy 2.6.3 release notes from the 2.6 branch

scrapy/scrapy,elacuesta/scrapy,elacuesta/scrapy,pablohoffman/scrapy,pablohoffman/scrapy,scrapy/scrapy,scrapy/scrapy,elacuesta/scrapy,pablohoffman/scrapy