Update gRPC API

src/main/java/bdchain/api/grpc/txledger/CreateLedgerResponseOrBuilder.java

@@ -0,0 +1,14 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: bdchain/api/tx_ledger.proto
+
+package bdchain.api.grpc.txledger;
+
+public interface CreateLedgerResponseOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:bdchain.api.txledger.CreateLedgerResponse)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * <code>bool ok = 1;</code>
+   */
+  boolean getOk();
+}