4.2.0
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Add improved ConnectionLimitingPool
The new ConnectionLimitingPool limits connections instead of streams. In addition, it has improved connection handling, racing between new connections and existing connections becoming available once the limit has been reached. The older LimitedConnectionPool has been renamed to StreamLimitingPool with a class alias for backward compatibility.
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Don't set ALPN if only HTTP/1.1 is enabled, which allows connections to certain misbehaving servers (#255)