Remove known issue about Ionic compatibility (#1708)

Since Ionic native 4.7.0, version 0.9 is supported. See: https://github.com/ionic-team/ionic-native/issues/2113#issuecomment-430595973

README.md

@@ -61,7 +61,6 @@ __Known issues__
 
 - Support for Android Oreo is limited yet.
 - v0.9 and v0.8 aren't compatible with each other (Wont fix)
-- __Not compatible yet with Ionic Native__. Their wrapper is not part of this plugin. In future I will contribute to them to fix such issues in time. But for the moment I am busy enough with the plugin itself.
 
 Please report bugs or missing features!