fix authorization builder

Author: adamint

README.md

@@ -29,7 +29,7 @@ repositories {
     jcenter()
 }
 
-compile group: 'com.adamratzman', name: 'spotify-api-kotlin', version: '2.3.01'
+compile group: 'com.adamratzman', name: 'spotify-api-kotlin', version: '2.3.02'
 ```
 
 To use the latest snapshot instead, you must add the Jitpack repository as well
@@ -51,7 +51,7 @@ dependencies {
 <dependency>
     <groupId>com.adamratzman</groupId>
     <artifactId>spotify-api-kotlin</artifactId>
-    <version>2.3.01</version>
+    <version>2.3.02</version>
 </dependency>
 
 <repository>

build.gradle

@@ -22,12 +22,10 @@ apply plugin: 'kotlin'
 apply plugin: 'org.jetbrains.dokka'
 
 group 'com.adamratzman'
-version '2.3.01'
+version '2.3.02'
 
 archivesBaseName = 'spotify-api-kotlin'
 
-sourceCompatibility = 1.8
-
 repositories {
     jcenter()
 }

src/main/kotlin/com/adamratzman/spotify/Builder.kt

@@ -194,8 +194,7 @@ class SpotifyUserAuthorizationBuilder(
     var tokenString: String? = null,
     var token: Token? = null
 ) {
-    fun build() = if (authorizationCode == null && tokenString == null && token == null) throw IllegalArgumentException("An authorization method must be supplied")
-    else SpotifyUserAuthorization(authorizationCode, tokenString, token)
+    fun build() = SpotifyUserAuthorization(authorizationCode, tokenString, token)
 }
 
 data class SpotifyUserAuthorization(