Version 1.8.0

Breaking changes

• now requires numpy >= 1.20 to work (otherwise there are
  issues with newer versions of pandas).
• issue #379 requires
  different behaviour depending on installed gym package.
• cooldowns are not consistent between env.step and obs.simulate.
  If obs.time_before_cooldown_line[l_id] > 0 it will be illegal, at the next call to env.step
  (and obs.simulate) to modify the status of this powerline l_id. Same for
  obs.time_before_cooldown_sub[s_id] > 0 if trying to modify topology of
  substation s_id. This also impacts the maintenances and hazards.
  This is also linked to github issue #148

Fixed issues

• a bug when using a Runner with an environment that has
  been copied (see #361)
• issue #358
• issue #363
• issue #364
• issue #365 and
  #376 . Now the function(s)
  gridobj.process_shunt_data and gridobj.process_grid2op_shunt_data are called
  gridobj.process_shunt_static_data
• issue #367
• issue #369
• issue #374
• issue #377 by adding a special
  method backend.update_thermal_limit_from_vect

Addition

• the "packaging" python package is now required to install grid2op.
  It allows to support different gym versions that changes behavior regarding
  numpy pseudo random generator.
• the function act.remove_line_status_from_topo to ignore the line status modification
  that would be induced by "set_bus" or "change_bus" when some cooldown applies on the powerline.

Improvement

• clarify documentation of gym compat module (see
  #372 and
  #373) as well as the doc
  for MultifolderWithCache (see #370)