Improved sample program in README

Author: minium

README.md

@@ -47,11 +47,17 @@ int main()
     std::string address = "127.0.0.1";
     int port = 8332;
 
-    /* Constructor to connect to the bitcoin daemon */
-    BitcoinAPI btc(username, password, address, port);
-
-    /* Example method - getbalance */
-    std::cout << "Wallet balance: " << btc.getbalance() << std::endl;
+    try
+    {
+        /* Constructor to connect to the bitcoin daemon */
+        BitcoinAPI btc(username, password, address, port);
+
+        /* Example method - getbalance */
+        std::cout << "Wallet balance: " << btc.getbalance() << std::endl;
+    }catch(BitcoinException e)
+    {
+        std::cerr << e.getMessage() << std::endl;
+    }
 }
 ```