Update README

README.md

@@ -178,7 +178,7 @@ Or if compiling the SCSS from the `src` dir, `@include` it from there:
 | **closeOpenLevels** | `true` | bool | Should all open sub levels be closed when the nav closes. |
 | **closeActiveLevel** | `false` | bool | Should initially active sub level (see [`data-nav-active`](#data-attributes)) be cleared when the nav closes. |
 | **closeOnClick** | `true` | bool | Close the navigation when links are clicked. |
-| **closeOnEsc** | `true` | bool | Close the navigation on Esc button. |
+| **closeOnEsc** | `true` | bool | Close the navigation on <kbd>Esc</kbd> button. |
 | **customToggle** | `null` | str / Element obj | Custom navigation toggle element. |
 | **activeToggleClass** | `null` | str | Custom active toggle class. |
 | **insertClose** | `true` | bool / int | Insert navigation close button. You can also use an integer representing 0-based index that will be the position of the button in the list. Negative numbers are also supported. |