Set default for readme in Manifest if it's not specified.
Set default for readme in Manifest if it's not specified.

If the readme field is not specified, assume a default of
"README.md" (temporarily). Further, if the readme field is set to
"false", then this defaulting behavior is suppressed.

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