Add default feature that enables all image features

Cargo.toml

@@ -30,6 +30,9 @@ categories = [
 [package.metadata.release]
 pre-release-commit-message = "Bump version to {{version}}"
 
+[features]
+default = ["image/default"]
+
 ### BEGIN
 # Fix an issue where `cargo bench -- --save-baseline` does not work.
 # For more details, please see https://bheisler.github.io/criterion.rs/book/faq.html#cargo-bench-gives-unrecognized-option-errors-for-valid-command-line-options