fix proguard issue with NotificationTypeAdapter (#1129)

app/src/main/java/com/keylesspalace/tusky/entity/Notification.kt

@@ -15,8 +15,11 @@
 
 package com.keylesspalace.tusky.entity
 
+import com.google.gson.JsonDeserializationContext
+import com.google.gson.JsonDeserializer
+import com.google.gson.JsonElement
+import com.google.gson.JsonParseException
 import com.google.gson.annotations.JsonAdapter
-import com.keylesspalace.tusky.json.NotificationTypeAdapter
 
 data class Notification(
         val type: Type,
@@ -59,4 +62,13 @@ data class Notification(
         val notification = other as Notification?
         return notification?.id == this.id
     }
+
+    class NotificationTypeAdapter : JsonDeserializer<Type> {
+
+        @Throws(JsonParseException::class)
+        override fun deserialize(json: JsonElement, typeOfT: java.lang.reflect.Type, context: JsonDeserializationContext): Notification.Type {
+            return Notification.Type.byString(json.asString)
+        }
+
+    }
 }

app/src/main/java/com/keylesspalace/tusky/json/NotificationTypeAdapter.kt

@@ -1,18 +0,0 @@
-package com.keylesspalace.tusky.json
-
-import com.google.gson.JsonDeserializationContext
-import com.google.gson.JsonDeserializer
-import com.google.gson.JsonElement
-import com.google.gson.JsonParseException
-import com.keylesspalace.tusky.entity.Notification
-
-import java.lang.reflect.Type
-
-class NotificationTypeAdapter : JsonDeserializer<Notification.Type> {
-
-    @Throws(JsonParseException::class)
-    override fun deserialize(json: JsonElement, typeOfT: Type, context: JsonDeserializationContext): Notification.Type {
-        return Notification.Type.byString(json.asString)
-    }
-
-}