v0.7.4
Fix initializing the global hash map with a small stack Fix https://github.com/servo/html5ever/issues/393 <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/string-cache/227) <!-- Reviewable:end -->