docs: Update proguard rules.

Author: FelipePaiva1992

README.md

@@ -94,6 +94,11 @@ If you use Proguard you will need to add these lines to `android/app/proguard-ru
 ```
 -keep public class com.dylanvann.fastimage.* {*;}
 -keep public class com.dylanvann.fastimage.** {*;}
+-keep public class * implements com.bumptech.glide.module.GlideModule
+-keep public class * extends com.bumptech.glide.module.AppGlideModule
+-keep public enum com.bumptech.glide.load.ImageHeaderParser$** {
+  **[] $VALUES;
+  public *;
 ```
 
 ## Properties