Keep synthesized values() for EnumJsonAdapter

moshi/src/main/resources/META-INF/proguard/moshi.pro

@@ -8,9 +8,11 @@
 -keep @com.squareup.moshi.JsonQualifier interface *
 
 # Enum field names are used by the integrated EnumJsonAdapter.
+# values() is synthesized by the Kotlin compiler and is used by EnumJsonAdapter indirectly
 # Annotate enums with @JsonClass(generateAdapter = false) to use them with Moshi.
 -keepclassmembers @com.squareup.moshi.JsonClass class * extends java.lang.Enum {
     <fields>;
+    **[] values();
 }
 
 # The name of @JsonClass types is used to look up the generated adapter.