Fix error when accessing head properties for history and profile data

mesaPlot/file_reader.py

@@ -204,7 +204,7 @@ def __getitem__(self, key):
             if key in self.data.dtype.names:
                 return self.data[key]
             if key in self.head.dtype.names:
-                return self.head[key][0]
+                return self.head[key]
 
         try:
             return self.__dict__[key]