Fix small inconsistency in README.md constant references

Author: erayd

README.md

@@ -188,9 +188,9 @@ third argument to `Validator::validate()`, or can be provided as the third argum
 | `Constraint::CHECK_MODE_COERCE_TYPES` | Convert data types to match the schema where possible |
 | `Constraint::CHECK_MODE_APPLY_DEFAULTS` | Apply default values from the schema if not set |
 | `Constraint::CHECK_MODE_EXCEPTIONS` | Throw an exception immediately if validation fails |
-| `CHECK_MODE_EARLY_COERCE` | Apply type coercion as soon as possible |
+| `Constraint::CHECK_MODE_EARLY_COERCE` | Apply type coercion as soon as possible |
 
-Please note that using `Constraint::CHECK_MODE_COERCE_TYPES` or `Constraint::CHECK_MODE_APPLY_DEFAULTS`
+Please note that using `CHECK_MODE_COERCE_TYPES` or `CHECK_MODE_APPLY_DEFAULTS`
 will modify your original data.
 
 `CHECK_MODE_EARLY_COERCE` has no effect unless used in combination with `CHECK_MODE_COERCE_TYPES`. If