f40f6b6b2d8ff86ba134d66407c95eaf5255c7a8
Update serde to 0.8 <!-- Reviewable:start --> This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-graphics-rs/53) <!-- Reviewable:end -->
Description
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