Fix typo in README (rjsf-team#680)

Author: cuyu

README.md

@@ -336,7 +336,7 @@ Please note that while standardized, `datetime-local` and `date` input elements
  * `radio`: a radio button group with enum values. **can only be used when `enum` values are specified for this input**
  * by default, a regular `input[type=text]` element is used.
 
-> Note: for numbers, `min`, `max` and `step` input attributes values will be handled according to JSONSchema's `minimum`, `maximium` and `multipleOf` values when they're defined.
+> Note: for numbers, `min`, `max` and `step` input attributes values will be handled according to JSONSchema's `minimum`, `maximum` and `multipleOf` values when they're defined.
 
 #### Disabled fields