Merge branch 'master' into 'seeding_tests_enhancement'

# Conflicts:
#   flatland/envs/rail_env.py

flatland/envs/rail_env.py

@@ -738,7 +738,7 @@ class RailEnv(Environment):
                 print("[WARNING] Unable to save the distance map for this environment, as none was found !")
 
         else:
-            with open(filename, "wb") as file_out:
+            with open(filename,"wb") as file_out:
                 file_out.write(self.get_full_state_msg())
 
     def load(self, filename):