Add Parceler

[StErMi]

Library name: Parceler
Library url: https://github.com/johncarl81/parceler

# Parcel library
-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}

-keep class org.parceler.Parceler$$Parcels

[Kevin Schultz]

Added in #108