Fix readme formatting

README.md

@@ -40,34 +40,36 @@ index in some theoretical sprite sheet.
 
 1. Create one or more rules that define a pattern to match, a value to output, and optionally a percentage
 chance for that rule to be chosen. 
-    * ```rust
-      use micro_autotile::AutoTileRule;
-      const GROUND: usize = 0;
-      const WALL: usize = 1;
-      
-      let alt_ground_rule = AutoTileRule::single_any_chance(GROUND, vec![123, 124, 125], 0.2);
-      let fallback_ground_rule = AutoTileRule::exact(GROUND, 126);
+   ```rust
+   use micro_autotile::AutoTileRule;
+   const GROUND: usize = 0;
+   const WALL: usize = 1;
+   
+   let alt_ground_rule = AutoTileRule::single_any_chance(GROUND, vec![123, 124, 125], 0.2);
+   let fallback_ground_rule = AutoTileRule::exact(GROUND, 126);
    ```
 2. (Optional) Put together your rules in a rule set. This can be skipped and the rule structs used directly
-    * ```rust
-      use micro_autotile::{AutoRuleSet, AutoTileRule};
-      let ground_rules = AutoRuleSet::new(vec![alt_ground_rule, fallback_ground_rule]);
-      let wall_rules = AutoTileRule::exact(WALL, 35).into();
-      let combined_rules = wall_rules + ground_rules;
-    ```
+   ```rust
+   use micro_autotile::{AutoRuleSet, AutoTileRule};
+   let ground_rules = AutoRuleSet::new(vec![alt_ground_rule, fallback_ground_rule]);
+   let wall_rules = AutoTileRule::exact(WALL, 35).into();
+   let combined_rules = wall_rules + ground_rules;
+   ```
+
 3. Elsewhere, generate a slice of level data wrapped in a `TileLayout` struct. This represents a single tile
    (the central element) and its surrounding neighbors. The order of the neighbors is important, and is laid
     out as though in a flattened grid.
-    * ```rust
-      use micro_autotile::TileLayout;
-      let layout = TileLayout::filled([
-        GROUND, GROUND, GROUND,
-        GROUND, WALL, GROUND,
-        GROUND, GROUND, GROUND,
-      ]);
+   ```rust
+   use micro_autotile::TileLayout;
+   let layout = TileLayout::filled([
+     GROUND, GROUND, GROUND,
+     GROUND, WALL, GROUND,
+     GROUND, GROUND, GROUND,
+   ]);
     ```
+
 4. Produce an output using either the rule set or the rule directly (the same methods exist for both)
-    * ```rust
-      let output = combined_rules.resolve_match(&layout);
-      assert_eq!(output, Some(35));
+   ```rust
+   let output = combined_rules.resolve_match(&layout);
+   assert_eq!(output, Some(35));
     ```
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