Merge pull request #44 from tronprotocol/add-reason-enum

add the reason code

Author: nanfengpo

core/Tron.proto

@@ -271,6 +271,7 @@ enum ReasonCode {
   INCOMPATIBLE_VERSION = 0x18;
   INCOMPATIBLE_CHAIN = 0x19;
   TIME_OUT = 0x20;
+  CONNECT_FAIL = 0x21;
   UNKNOWN = 0xFF;
 }