add command for master private key

lib/commands.py

@@ -322,6 +322,11 @@ class Commands:
         """Get master public key. Return your wallet\'s master public key(s)"""
         return self.wallet.get_master_public_keys()
 
+    @command('wp')
+    def getmasterprivate(self):
+        """Get master private key. Return your wallet\'s master private key"""
+        return str(self.wallet.get_master_private_key(self.wallet.root_name, self.password))
+
     @command('wp')
     def getseed(self):
         """Get seed phrase. Print the generation seed of your wallet."""