Fix spelling in README.md (#975)

Author: pfcodes

README.md

@@ -146,7 +146,7 @@ For advanced usage please take a look into our [example project](https://github.
 | -------------------------------------------------------------------- | :-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | :------: |
 | `initialPage`                                                        |                                                                                                            Index of initial page that should be selected                                                                                                            |   both   |
 | `scrollEnabled: boolean`                                             |                                                                                                            Should pager view scroll, when scroll enabled                                                                                                            |   both   |
-| `onPageScroll: (e: PageScrollEvent) => void`                         |                                                    Executed when transitioning between pages (ether because the animation for the requested page has changed or when the user is swiping/dragging between pages)                                                    |   both   |
+| `onPageScroll: (e: PageScrollEvent) => void`                         |                                                    Executed when transitioning between pages (either because the animation for the requested page has changed or when the user is swiping/dragging between pages)                                                    |   both   |
 | `onPageScrollStateChanged: (e: PageScrollStateChangedEvent) => void` |                                                                                                      Function called when the page scrolling state has changed                                                                                                      |   both   |
 | `onPageSelected: (e: PageSelectedEvent) => void`                     |                                                                                      This callback will be called once the ViewPager finishes navigating to the selected page                                                                                       |   both   |
 | `pageMargin: number`                                                 |                                                                                                                Blank space to be shown between pages                                                                                                                |   both   |