Mention sleep action in keyboard commands.

README.md

@@ -53,18 +53,19 @@ python3 -m crafter.run_gui      # Start the game
 
 | Key | Action |
 | :-: | :----- |
-| WASD | Move around. |
+| WASD | Move around |
 | SPACE| Collect material, drink from lake, hit creature |
-| T | Place a table. |
-| R | Place a rock. |
-| F | Place a furnace. |
-| P | Place a plant. |
-| 1 | Craft a wood pickaxe. |
-| 2 | Craft a stone pickaxe. |
-| 3 | Craft an iron pickaxe. |
-| 4 | Craft a wood sword. |
-| 5 | Craft a stone sword. |
-| 6 | Craft an iron sword. |
+| TAB | Sleep |
+| T | Place a table |
+| R | Place a rock |
+| F | Place a furnace |
+| P | Place a plant |
+| 1 | Craft a wood pickaxe |
+| 2 | Craft a stone pickaxe |
+| 3 | Craft an iron pickaxe |
+| 4 | Craft a wood sword |
+| 5 | Craft a stone sword |
+| 6 | Craft an iron sword |
 
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