fix: free address info after get it using evutil_getaddrinfo (#431)

diff --git a/src/transport/TcpTransport.cpp b/src/transport/TcpTransport.cpp
index d297b1a..6776da5 100644
--- a/src/transport/TcpTransport.cpp
+++ b/src/transport/TcpTransport.cpp
@@ -126,6 +126,7 @@
         }
       }
     }
+    evutil_freeaddrinfo(answer);
   }
 
   return addr;