Update README.md

README.md

     - `"base64"`: encode as base64 and returns the raw string. Use only with small images as this may result of lags (the string is sent over the bridge). *N.B. This is not a data uri, use `data-uri` instead*.
     - `"data-uri"`: same as `base64` but also includes the [Data URI scheme](https://en.wikipedia.org/wiki/Data_URI_scheme) header.
  - **`filename`** *(string)*: the name of the generated file if any (Android only). Defaults to `ReactNative_snapshot_image_${timestamp}`.
- - **`snapshotContentContainer`** *(bool)*: View is evaluated the real height when the value is true.(Android only)
+ - **`snapshotContentContainer`** *(bool)*: if true and when view is a ScrollView, the "content container" height will be evaluated instead of the container height. (Android only)
 
 ## Caveats