Update README.md

Author: g1eb

README.md

@@ -76,10 +76,10 @@ For both date and time input:
 | secondStep | step size for second input | 1 | no |
 | placeholder | Placeholder is shown when input object is undefined | none | no |
 | allowClear | Allow users to clear selected datetime value | false | no |
-| clearText | Clear text shown in the button to clear date object | none | no |
+| clearText | Clear text shown in the button to clear date object | Clear | no |
 | on-change | Handler function that is fired on change of datetime object | none | no |
 | on-close | Handler function that is fired on close of the edit popover | none | no |
-| css-class | custom css class name for datetime presentation | predefined | no |
+| css-class | custom css class name for datetime presentation | none | no |
 
 ## Dependencies