- Update to v1.34
  * The position classes have gained methods frame_xyz(), 
    frame_xyz_and_velocity(), frame_latlon(), and 
    from_time_and_frame_vectors() that work with a new 
    library skyfield.framelib to offer a number of familiar 
    reference frames. These replace the existing ad-hoc 
    position methods for ecliptic and galactic coordinates, 
    which are now deprecated (but will continue to be 
    supported). See Coordinates in other reference frames.
  * Added support for IERS Polar Motion 𝑥 and 𝑦.
  * Added a method lst_hours_at() that computes Local 
    Sidereal Time.
  * A new almanac routine moon_phase() returns the Moon 
    phase as an angle where 0° is New Moon, 90° is First 
    Quarter, 180° is Full, and 270° is Last Quarter. #282
  * Almanac search routines that previously returned a 
    Boolean true/false array now return an integer 0/1 
    array instead, to work around a new deprecation warning 
    in NumPy which, for example, would have outlawed using 
    the Boolean array from moon_nodes() to index into the 
    MOON_NODES list that provides a name for each node. #486
  * The undocumented columns magnitude_H and magnitude_G 
    in the Minor Planet Center comets dataframe have been 
    renamed magnitude_g and magnitude_k following further 
    research on the file format (which does not itself 
    document which magnitude model is intended). #416
- add finals2000A.all to testdata
- Define skip_python36 for TW, because current astropy needs
  Python >=3.7

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