Log Message:
www/hs-http2: Update to 5.2.1

5.2.1
    Using time-manager v0.1.0. #115

5.2.0
    Using http-semantics #114
    Header of http-types should be used as high-level header.
    TokenHeader of http-semantics should be used as low-level header.
    Breaking change: encodeHeader takes Header of http-types.
    Breaking change: decodeHeader returns Header of http-types.
    Breaking change: HeaderName as ByteString is removed.

5.1.4
    Using network-control v0.1.

5.1.3
    Defining SendRequest type synonym. #111

5.1.2
    Make ping rate limit configurable #108

5.1.1
    Deal with RST_STREAM in HalfClosedLocal state #107

5.1.0
    Drop frames after reset #106
    BREAKING CHANGE: Use String for Authority #105
    Properly close streams #104

5.0.1
    Allowing bytestring 0.12.

5.0.0
    Using the network-control package.
    The limits of resources can be specified in ServerConfig and ClientConfig.
    Open streams based on peer's MaxStreams.
    Rejecting Data if it is over the receiving limit.
    Informing MaxStreams properly.
    Informing WindowUpdate properly.
    New API: Server.Internal.runIO and Client.Internal.runIO.