fix: added missing decorators

app/src/main/java/com/cappielloantonio/tempo/github/models/Assets.kt

@@ -1,7 +1,9 @@
 package com.cappielloantonio.tempo.github.models
 
+import androidx.annotation.Keep
 import com.google.gson.annotations.SerializedName
 
+@Keep
 data class Assets(
         @SerializedName("url")
         var url: String? = null,

app/src/main/java/com/cappielloantonio/tempo/github/models/Author.kt

@@ -1,7 +1,9 @@
 package com.cappielloantonio.tempo.github.models
 
+import androidx.annotation.Keep
 import com.google.gson.annotations.SerializedName
 
+@Keep
 data class Author(
         @SerializedName("login")
         var login: String? = null,

app/src/main/java/com/cappielloantonio/tempo/github/models/LatestRelease.kt

@@ -1,7 +1,9 @@
 package com.cappielloantonio.tempo.github.models
 
+import androidx.annotation.Keep
 import com.google.gson.annotations.SerializedName
 
+@Keep
 data class LatestRelease(
         @SerializedName("url")
         var url: String? = null,

app/src/main/java/com/cappielloantonio/tempo/github/models/Reactions.kt

@@ -1,7 +1,9 @@
 package com.cappielloantonio.tempo.github.models
 
+import androidx.annotation.Keep
 import com.google.gson.annotations.SerializedName
 
+@Keep
 data class Reactions(
         @SerializedName("url")
         var url: String? = null,

app/src/main/java/com/cappielloantonio/tempo/github/models/Uploader.kt

@@ -1,7 +1,9 @@
 package com.cappielloantonio.tempo.github.models
 
+import androidx.annotation.Keep
 import com.google.gson.annotations.SerializedName
 
+@Keep
 data class Uploader(
         @SerializedName("login")
         var login: String? = null,