add close tag

Author: nissy-dev

README.md

@@ -644,7 +644,7 @@ RNFetchBlob.fs.readStream(
       console.log('oops', err)
     })
     ifstream.onEnd(() => {  
-      <Image source={{ uri : 'data:image/png,base64' + data }}
+      <Image source={{ uri : 'data:image/png,base64' + data }}/>
     })
 })
 ```