adressing issue rte-france#569 [skip ci]

CHANGELOG.rst

@@ -39,6 +39,7 @@ Change Log
 - [FIXED] `PandapowerBackend`, when no slack was present
 - [FIXED] the "BaseBackendTest" class did not correctly detect divergence in most cases (which lead 
   to weird bugs in failing tests)
+- [FIXED] an issue with imageio having deprecated the `fps` kwargs (see https://github.com/rte-france/Grid2Op/issues/569)
 - [ADDED] A type of environment that does not perform the "emulation of the protections"
   for some part of the grid (`MaskedEnvironment`) see https://github.com/rte-france/Grid2Op/issues/571
 - [IMPROVED] the CI speed: by not testing every possible numpy version but only most ancient and most recent

grid2op/Episode/EpisodeReplay.py

@@ -102,15 +102,15 @@ def replay_episode(
 
         load_info: ``str``
             Defaults to "p". What kind of values to show on loads.
-            Can be oneof `["p", "v", None]`
+            Can be one of `["p", "v", None]`
 
         gen_info: ``str``
             Defaults to "p". What kind of values to show on generators.
-            Can be oneof `["p", "v", None]`
+            Can be one of `["p", "v", None]`
 
         line_info: ``str``
             Defaults to "rho". What kind of values to show on lines.
-            Can be oneof `["rho", "a", "p", "v", None]`
+            Can be one of `["rho", "a", "p", "v", None]`
 
         resolution: ``tuple``
             Defaults to (1280, 720). The resolution to use for the gif.
@@ -187,7 +187,12 @@ def replay_episode(
         # Export all frames as gif if enabled
         if gif_name is not None and len(frames) > 0:
             try:
-                imageio.mimwrite(gif_path, frames, fps=fps)
+                try:
+                    # with imageio > 2.5 you need to compute the duration
+                    imageio.mimwrite(gif_path, frames, duration=1000./fps)
+                except TypeError:
+                    # imageio <= 2.5 can be given fps directly
+                    imageio.mimwrite(gif_path, frames, fps=fps)
                 # Try to compress
                 try:
                     from pygifsicle import optimize