Merge pull request #1690 from jonalmeida/patch-1

Update recommended Android proguard rules

Author: matthiasblaesing

www/FrequentlyAskedQuestions.md

@@ -218,6 +218,7 @@ If you're using Proguard, you should also add the following to your Proguard rul
 ```
 -dontwarn java.awt.*
 -keep class com.sun.jna.* { *; }
+-keep class * extends com.sun.jna.* { *; }
 -keepclassmembers class * extends com.sun.jna.* { public *; }
 ```
 
@@ -288,4 +289,4 @@ ant -lib lib/clover.jar clover
 ```
 
 The result is placed in `$JNA_BASE/build/reports/clover` and can be opened with
-a webbrowser.
+a webbrowser.