build(android): enable Hermes

@@ -77,7 +77,7 @@ import com.android.build.OutputFile
 
 project.ext.react = [
     entryFile: "index.js",
-    enableHermes: false,  // clean and rebuild if changing
+    enableHermes: true,  // clean and rebuild if changing
 ]
 
 apply from: "../../node_modules/react-native/react.gradle"

@@ -8,3 +8,5 @@
 #   http://developer.android.com/guide/developing/tools/proguard.html
 
 # Add any project specific keep options here:
+
+-keep class com.facebook.hermes.unicode.** { *; }