Update to version 0.3.3

  * Add python 3.6 and 3.7 to script compiling wheels for windows
  * Fix enumerate_ids for python3
  * In Cython 0.28 it is now forbbiden to assign None to a int, so we use 0
    instead for an address port.

setup.py

@@ -9,7 +9,7 @@
 except ImportError:
     has_cython = False
 
-VERSION = "0.3.2"
+VERSION = "0.3.3"
 
 if __name__ == "__main__":
     c_extensions = [