message: update readme with new features
diff: @@ -349,10 +349,12 @@ slide.addChart({TYPE}, {DATA}, {OPTIONS});
  ### Chart Axis Options
  | Option | Type | Unit | Default | Description | Possible Values |
  | :--------------------- | :------ | :------ | :-------- | :---------------------- | :----------------------------------------- |
  +| `axisLabelFormatCode` | string | | | format to show axis value | format string. Ex: `{ axisLabelFormatCode:'#,##0' }` [MicroSoft Number Format Codes](https://support.office.com/en-us/article/Number-format-codes-5026bbd6-04bc-48cd-bf33-80f18b4eae68) |
  | `catAxisLabelColor` | string | | `000000` | category-axis color | hex color code. Ex: `{ catAxisLabelColor:'0088CC' }` |
  | `catAxisLabelFontFace` | string | | `Arial` | category-axis font face | font name. Ex: `{ titleFontFace:'Arial' }` |
  | `catAxisLabelFontSize` | number | points | `18` | category-axis font size | 1-256. Ex: `{ titleFontSize:12 }` |
  | `catAxisOrientation` | string | | `minMax` | category-axis orientation | `maxMin` (high->low) or `minMax` (low->high) |
  +| `majorUnit` | number | float | `1.0` | axis tick steps | Float or whole number. Ex: `{ majorUnit:0.2 }` |
  | `valAxisLabelColor` | string | | `000000` | value-axis color | hex color code. Ex: `{ valAxisLabelColor:'0088CC' }` |
  | `valAxisLabelFontFace` | string | | `Arial` | value-axis font face | font name. Ex: `{ titleFontFace:'Arial' }` |
  | `valAxisLabelFontSize` | number | points | `18` | value-axis font size | 1-256. Ex: `{ titleFontSize:12 }` |
  