changes Header.dump from method to attribute

src/classes.py

@@ -6,10 +6,7 @@ class Header:
         '''Init method, apikey suggested but not required (empty by default).'''
         self.auth = {"Authorization" : apikey}
         self.content = {"Content-Type" : "application/json"}
-    def dump(self):
-        '''Dumps the header in form of a dictionary.'''
-        dump = {**self.auth, **self.content}
-        return dump
+        self.dump = {**self.auth, **self.content}
 
 if __name__=="__main__":
     head = Header("MyApiKey-123456789abcdef")