Adjusted cleanup colors for river, stream, and waste cells so that rivers appear light-grey-blue and wastes appear brown when rendered. Fixes #176

[ldfrancis]

When the env is rendered, river and stream cells appear brown while waste cells appear light-grey-blue. This results from the rgb color list assigned to this cells in the cleanup color dictionary

sequential_social_dilemma_games/social_dilemmas/envs/cleanup.py

Lines 12 to 16 in 9d1809f

	# Custom colour dictionary
	CLEANUP_COLORS = {'C': [100, 255, 255], # Cyan cleaning beam
	'S': [113, 75, 24], # Light grey-blue stream cell
	'H': [99, 156, 194], # brown waste cells
	'R': [113, 75, 24]} # Light grey-blue river cell

The rgb list, [99, 156, 194], is light grey-blue while [113, 75, 24] is brown. The color dictionary was modified to depict the correct rgb color for light grey-blue and brown (i.e swapping the current values for light grey-blue and brown).

[ldfrancis]

@eugenevinitsky, Please can you help review this?

[eugenevinitsky]

Hi, sorry about this. I don't check this repo very often; unfortunately the colors are correct on my machine. Any ideas why that might be?