Cargo Features

embed-doc-image-showcase has no features set by default.

[dependencies]
embed-doc-image-showcase = { version = "0.1.2", features = ["doc-images"] }
doc-images

This is a necessary workaround so that we can embed images in crate-level documentation for Rust >= 1.54,
while at the same time have the code working (without images in crate-level documentation) for older compilers