update CHANGES, add 0.49.2 release notes
update CHANGES, add 0.49.2 release notes

EvilMcJerkface/crate,sunny256/crate,husky-koglhof/crate,sunny256/crate,adrpar/crate,crate/crate,puneetjaiswal/crate,aslanbekirov/crate,aslanbekirov/crate,gmrodrigues/crate,sunny256/crate,gmrodrigues/crate,husky-koglhof/crate,crate/crate,EvilMcJerkface/crate,husky-koglhof/crate,adrpar/crate,aslanbekirov/crate,crate/crate,EvilMcJerkface/crate,puneetjaiswal/crate,adrpar/crate,gmrodrigues/crate,puneetjaiswal/crate