Update proguard-rules.pro

Do not obfuscate the Approov SDK

Author: ivolz

shapes-app/app/proguard-rules.pro

@@ -15,3 +15,4 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+-keep class com.criticalblue.approovsdk.** {*;}