support org.apache.dubbo 2.7.x

[nickfan]

current version of dubbo-rpc-jsonrpc is write for com.alibaba.dubbo version 2.4.x - 2.6.x

could someone rewrite the code for support org.apache.dubbo 2.7.x

change

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo_version}</version>
            <optional>true</optional>
        </dependency>

into

        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo_version}</version>
            <optional>true</optional>
        </dependency>

and rewrite the JsonRpcProtocol class there is no more com.alibaba.dubbo.rpc.protocol.AbstractProxyProtocol