Update changelog for 1.49
Update changelog for 1.49

tshepang/cargo,nipunn1313/cargo,nipunn1313/cargo,rustyhorde/cargo,rustyhorde/cargo,rust-lang/cargo,rustyhorde/cargo,eminence/cargo,tshepang/cargo,eminence/cargo,tshepang/cargo,rustyhorde/cargo,nipunn1313/cargo,rust-lang/cargo,rust-lang/cargo,nipunn1313/cargo,rust-lang/cargo,eminence/cargo,tshepang/cargo,eminence/cargo