Fix pyflakes warning

py65/monitor.py

@@ -740,6 +740,7 @@ def main(args=None):
 
     try:
         import readline
+        readline = readline  # pyflakes
     except ImportError:
         pass
 

py65/tests/test_memory.py

@@ -77,6 +77,7 @@ class ObservableMemoryTests(unittest.TestCase):
         mem.subscribe_to_read([0xC000], read_subscriber)
 
         value = mem[0xC000]
+        value = value  # pyflakes
         self.assertEqual(['read_subscriber'], calls)
 
     # __getitem__