updated plugin version, added new options to hide/show scrollbars #165, initial support for DownloadManager in Android and iOS

Update readme example

migrating to swift 5.0

Fix abstract method error  && swift version error

Create issue and pull request templates 

Resolving gradle error.

Android takeScreenshot does not work properly.

Remove async call in close Swift

Avoid null pointer exception after webview is disposed

Column does not accept null widget

This version of flutter_inappbrowser (1.2.1) breaks the gradle build, because the wrong link is set.

Remove headers_build_phase from example's Podfile

Fix crash on xcode 10.2

add new option to control the contentMode in Android platform

Fixes #106

Adds a transparentBackground option for iOS and Android

The 'open' method requires an options dictionary

iOS: Call setNeedsLayout() in scrollViewDidScroll()

This is useful to prevent a brief white flash on initialization
for apps that use a dark theme.

Otherwise, SwiftFlutterPlugin.swift throws an exception on line 285
when the InAppBrowser.openWithSystemBrowser(url) method is called:

  let options = (arguments["options"] as? [String: Any])!

Otherwise, the web view scrolls in blank white space which
doesn't get painted until the scroll gesture is finished,
because the WKWebView hasn't rendered that part of the
viewport to its offscreen buffer.