Typo: "sring" -> "string"

README.md

@@ -716,7 +716,7 @@ byte_size('Hello World') # 11
 
 Capitalizes the first letter of a string.
 
-Capitalizes the fist letter of the sring and then adds it with rest of the string. Omit the `lower_rest` parameter to keep the rest of the string intact, or set it to `true` to convert to lowercase.
+Capitalizes the fist letter of the string and then adds it with rest of the string. Omit the `lower_rest` parameter to keep the rest of the string intact, or set it to `true` to convert to lowercase.
 ```py
 def capitalize(string, lower_rest=False):
     return string[:1].upper() + (string[1:].lower() if lower_rest else string[1:])