Added BackupCurrencyApi.kt to supplement currency sources in case of no working api

app/build.gradle

@@ -4,13 +4,13 @@ apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-kapt'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
     defaultConfig {
         applicationId "com.appttude.h_mal.easycc"
-        minSdkVersion 23
-        targetSdkVersion 29
-        versionCode 2
-        versionName "1.1"
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode 5
+        versionName "4.1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -24,6 +24,15 @@ android {
     }
 
     viewBinding.enabled = true
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+
 }
 
 dependencies {
@@ -40,8 +49,10 @@ dependencies {
     testImplementation "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
 
     //Retrofit and GSON
-    implementation 'com.squareup.retrofit2:retrofit:2.6.0'
-    implementation 'com.squareup.retrofit2:converter-gson:2.6.0'
+    def retrofit_ver = "2.8.1"
+    implementation "com.squareup.retrofit2:retrofit:$retrofit_ver"
+    implementation "com.squareup.retrofit2:converter-gson:$retrofit_ver"
+    implementation "com.squareup.okhttp3:logging-interceptor:4.9.0"
 
     //Kotlin Coroutines
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0"