Trim old items from TODO list

Author: brandon-rhodes

TODO

@@ -1,15 +1,5 @@
 PyEphem TODO list
 
- For 3.7.6:
-
  - Add functions for perihelion and aphelion.
  - Make Jupiter's GRS available.
-
- For future releases:
-
  - Error should be raised if degrees() or hours() ignores end of string.
- - Ability to create Observer from Google Maps or Google Earth location;
-   or maybe from address?
- - New rising/setting/transit routines need to survive earth satellites.
- - ... and rewrite the tutorial to use the new routines for the ISS.
- - Update Tutorial for the three kinds of ra/dec.