Generalize HeaderMap's TryFrom impl from HashMap, to allow other hashing algorithms #729
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Instead of
impl TryFrom<&'a HashMap<K, V>> for HeaderMap<T>
this PR changes this toimpl TryFrom<&'a HashMap<K, V, S>> for HeaderMap<T>
.No change in behaviour, it only makes the input type more general so it allows passing hashmaps with other hashing functions as well.
This change is fully backwards-compatible because of the no-orphans rule.
Fixes #726