Update clients according to API updates

src/main/java/bdchain/api/TransactionLedgerClient.java

@@ -51,6 +51,40 @@ public class TransactionLedgerClient {
     channel.shutdown().awaitTermination(5, TimeUnit.SECONDS);
   }
 
+  /**
+   * <a
+   * href="https://phabricator.internetapi.cn/w/public/bdchain/grpc-api/#clientversion">查询节点客户端版本</a>
+   * （非阻塞）
+   */
+  public ListenableFuture<ClientVersionResponse> clientVersion() {
+
+    info("*** clientVersion");
+
+    try {
+      return futureStub.clientVersion(Empty.getDefaultInstance());
+    } catch (StatusRuntimeException e) {
+      warning("RPC failed: {0}", e.getStatus());
+      return null;
+    }
+  }
+
+  /**
+   * <a
+   * href="https://phabricator.internetapi.cn/w/public/bdchain/grpc-api/#clientversion">查询节点客户端版本</a>
+   * （阻塞）
+   */
+  public ClientVersionResponse clientVersionSync() {
+
+    info("*** clientVersionSync");
+
+    try {
+      return blockingStub.clientVersion(Empty.getDefaultInstance());
+    } catch (StatusRuntimeException e) {
+      warning("RPC failed: {0}", e.getStatus());
+      return null;
+    }
+  }
+
   /**
    * <a href="https://phabricator.internetapi.cn/w/public/bdchain/grpc-api/#createledger">创建账本</a>
    * （非阻塞）