fix showsHorizontalScrollIndicator in README.md (#159)

README.md

@@ -70,7 +70,7 @@ import { Dimensions } from 'react-native'
 | __scrollEnabledWithZoomedin__                     |  false   |                                                `PropTypes.bool`                                                 | Making the webview scrollable on iOS when zoomed in even if scrollEnabled is false.                                                                        |
 | __viewportContent__                     |  'width=device-width' on iOS   |                                                `PropTypes.string`                                                 | Please note that 'width=device-width' with scalesPageToFit may cause some layout issues on Android, for these conditions, using __customScript__ prop to apply custom viewport meta.                                                                        |
 | __showsVerticalScrollIndicator__ |  false  |                                                `PropTypes.bool`                                                 | False by default (different from react-native-webview).                                                                                                                                                      |
-| __showsVerticalScrollIndicator__ |  false  |                                                `PropTypes.bool`                                                 | False by default (different from react-native-webview).                                                                                                                                                      |
+| __showsHorizontalScrollIndicator__ |  false  |                                                `PropTypes.bool`                                                 | False by default (different from react-native-webview).                                                                                                                                                      |
 | __originWhitelist__              |  ['*']  |                                      `PropTypes.arrayOf(PropTypes.string)`                                      |  Validate any origin by default cause of most cases using static HTML concerns.                                                                                                                                                                                                           |
 
 ## demo
@@ -86,4 +86,4 @@ For android, you may have to copy the "Users\UserName\.android\debug.keystore" t
 
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