Replace HashMap with Vec in negotiate_languages #12
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According to @cmyr, this reduces the size of druid from 850.5KiB to 841.7KiB.
This is a slight change in behavior: if two entries have the same language ID, now both entries will be returned instead of the first one. I think the new behavior is preferable though.
I'll leave it up to you to decide whether this is a breaking change 馃檪
Partially addresses projectfluent/fluent-rs#139