Update README for v0.6.0

Author: afshinm

README.md

@@ -251,7 +251,7 @@ introJs().onbeforechange(function(targetElement) {
 
 ###Attributes:
  - `data-intro`: The tooltip text of step
- - `data-step`: The number of step
+ - `data-step`: Optionally define the number (priority) of step
  - `data-tooltipClass`: Optionally define a CSS class for tooltip
  - `data-position`: Optionally define the position of tooltip, `top`, `left`, `right` or `bottom`. Default is `bottom`
 
@@ -266,7 +266,10 @@ introJs().onbeforechange(function(targetElement) {
  - `tooltipClass`: Adding CSS class to all tooltips
  - `exitOnEsc`: Exit introduction when pressing Escape button, `true` or `false`
  - `exitOnOverlayClick`: Exit introduction when clicking on overlay layer, `true` or `false`
- - `showStepNumbers`: Show steps number in the red circle or not, `true` of `false`
+ - `showStepNumbers`: Show steps number in the red circle or not, `true` or `false`
+ - `keyboardNavigation`: Navigating with keyboard or not, `true` or `false`
+ - `showButtons`: Show introduction navigation buttons or not, `true` or `false`
+ - `showBullets`: Show introduction bullets or not, `true` or `false`
 
 See [setOption](https://github.com/usablica/intro.js/#introjssetoptionoption-value) to see an example.