[serde-generate] Fix --target-source-dir required message (#89)
[serde-generate] Fix --target-source-dir required message (#89)

* generate: Fix --target-source-dir required message

* generate: cargo fmt

novifinancial/serde-reflection,novifinancial/serde-reflection,novifinancial/serde-reflection,novifinancial/serde-reflection,novifinancial/serde-reflection,novifinancial/serde-reflection,novifinancial/serde-reflection,novifinancial/serde-reflection,novifinancial/serde-reflection