Added __slots__ to Token class to save some memory

Author: beniwohli

sourcemap/objects.py

@@ -19,6 +19,9 @@ class Token(object):
         Source column number: src_col
         Name of the token: name
     """
+
+    __slots__ = ['dst_line', 'dst_col', 'src', 'src_line', 'src_col', 'name']
+
     def __init__(self, dst_line=0, dst_col=0, src='', src_line=0, src_col=0, name=None):
         self.dst_line = dst_line
         self.dst_col = dst_col