Format supported games in a list.

README.md

@@ -44,20 +44,75 @@ a bug in previous releases of 10.14 which breaks VSync.
 ## Supported Games
 
 `ArcadeLearningEnvironment` will attempt to download the
-game ROMs, if not found in the path you provide when
+game ROMs if they are not found in the path you provide when
 building the emulator. This means you never have to worry
-about finding and downloading game ROMs yourself. The
-following games are currently supported: Adventure,
-Air Raid, Alien, Amidar, Assault, Asterix, Asteroids,
-Atlantis, Bank Heist, Battle Zone, Beam Rider, Berzerk,
-Bowling, Boxing, Breakout, Carnival, Centipede, Chopper
-Command, Crazy Climber, Defender, Demon Attack, Double
-Dunk, Elevator Action, Enduro, Fishing Derby, Freeway,
-Frostbite, Gopher, Gravitar, Hero, Ice Hockey, James Bond,
-Journey Escape, Kaboom, Kangaroo, Krull, Kung Fu Master,
-Montezuma Revenge, Ms Pacman, Name This Game, Phoenix,
-Pitfall, Pong, Pooyan, Private Eye, Q*bert, River Raid,
-Road Runner, Robotank, Seaquest, Skiing, Solaris, Space
-Invaders, Star Gunner, Tennis, Time Pilot, Tutankham,
-Up N' Down, Venture, Video Pinball, Wizard Of Wor, Yars'
-Revenge, Zaxxon.
+about finding and downloading game ROMs yourself.
+
+The following games are currently supported:
+- Adventure
+- Air Raid
+- Alien
+- Amidar
+- Assault
+- Asterix
+- Asteroids
+- Atlantis
+- Bank Heist
+- Battle Zone
+- Beam Rider
+- Berzerk
+- Bowling
+- Boxing
+- Breakout
+- Carnival
+- Centipede
+- Chopper
+- Command
+- Crazy Climber
+- Defender
+- Demon Attack
+- Double
+- Dunk
+- Elevator Action
+- Enduro
+- Fishing Derby
+- Freeway
+- Frostbite
+- Gopher
+- Gravitar
+- Hero
+- Ice Hockey
+- James Bond
+- Journey Escape
+- Kaboom
+- Kangaroo
+- Krull
+- Kung Fu Master
+- Montezuma Revenge
+- Ms Pacman
+- Name This Game
+- Phoenix
+- Pitfall
+- Pong
+- Pooyan
+- Private Eye
+- Q*bert
+- River Raid
+- Road Runner
+- Robotank
+- Seaquest
+- Skiing
+- Solaris
+- Space
+- Invaders
+- Star Gunner
+- Tennis
+- Time Pilot
+- Tutankham
+- Up N' Down
+- Venture
+- Video Pinball
+- Wizard Of Wor
+- Yars'
+- Revenge
+- Zaxxon