Update requirement versions

Author: onevcat

README.md

@@ -22,9 +22,9 @@ The LINE SDK supports the OpenID Connect 1.0 specification. You can get ID token
 
 ### Prerequisites
 
-* iOS 10.0 or later as the deployment target.
-* Android `minSdkVersion` set to 17 or higher (Android 4.2 or later).
-* Unity 2017.4 or later.
+* iOS 13.0 or later as the deployment target.
+* Android `minSdkVersion` set to 24 or higher (Android 7.0 or later).
+* Unity 2020.3.15 or later.
 
 To use the LINE SDK with your game, follow the steps below.