Update builder design pattern

Downloader/build.gradle

@@ -36,7 +36,7 @@ publishing {
         release(MavenPublication) {
             groupId = 'com.github.mutkuensert'
             artifactId = 'downloader'
-            version = 'v2.3.0'
+            version = 'v2.3.1'
 
             afterEvaluate {
                 from components.release

Downloader/src/main/java/com/mutkuensert/downloader/Downloader.kt

@@ -82,34 +82,20 @@ open class Downloader private constructor(
         createNotificationChannelIfActive()
     }
 
-    /**
-     * @property context is mandatory. If not set, NullPointerException will be thrown.
-     *
-     * @property scope is mandatory. If not set, NullPointerException will be thrown
-     */
-    class Builder {
+    class Builder(
+        private val context: Context,
+        private val scope: CoroutineScope
+    ) {
         private var areNotificationsActive = false
-        private var scope: CoroutineScope? = null
-        private var context: Context? = null
 
         fun build(): Downloader {
             return Downloader(
-                scope = scope!!,
-                context = context!!,
+                scope = scope,
+                context = context,
                 areNotificationsActive = areNotificationsActive
             )
         }
 
-        fun context(context: Context): Builder {
-            this.context = context
-            return this
-        }
-
-        fun scope(scope: CoroutineScope): Builder {
-            this.scope = scope
-            return this
-        }
-
         /**
          * Default is false.
          */

README.md

@@ -20,7 +20,7 @@ maven { url 'https://jitpack.io' }
 
 Add the dependency in build.gradle file.
 ```gradle
-implementation 'com.github.mutkuensert:downloader:v2.3.0'
+implementation 'com.github.mutkuensert:downloader:v2.3.1'
 ```
 
 **You can also add the library locally. To do that:**