Added extra error message.

src/base/net/stratum/Client.h

@@ -96,6 +96,7 @@ private:
     bool parseLogin(const rapidjson::Value &result, int *code);
     bool send(BIO *bio);
     bool verifyAlgorithm(const Algorithm &algorithm, const char *algo) const;
+    bool write(const uv_buf_t &buf);
     int resolve(const String &host);
     int64_t send(size_t size);
     void connect(sockaddr *addr);