Fix crashes in release due to ProGuard

app/build.gradle

@@ -20,6 +20,7 @@ android {
         release {
             minifyEnabled true
             shrinkResources true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
 
         debug {

app/proguard-rules.pro

@@ -0,0 +1,31 @@
+-dontwarn
+-ignorewarnings
+
+# RetroFit
+-dontwarn retrofit.**
+-keep class retrofit.** { *; }
+-keepattributes Signature
+-keepattributes Exceptions
+
+# Glide
+-keep public class * implements com.bumptech.glide.module.GlideModule
+-keep public enum com.bumptech.glide.load.resource.bitmap.ImageHeaderParser$** {
+    **[] $VALUES;
+    public *;
+}
+
+# ButterKnife
+-keep class butterknife.** { *; }
+-dontwarn butterknife.internal.**
+-keep class **$$ViewBinder { *; }
+-keepclasseswithmembernames class * {
+    @butterknife.* <fields>;
+}
+-keepclasseswithmembernames class * {
+    @butterknife.* <methods>;
+}
+
+-keep class !android.support.v7.internal.view.menu.**,** {*;}
+
+# Jellyfin API models
+-keepclasseswithmembers class org.jellyfin.apiclient.model.**.* { *; }