update version to 1.0.3

Author: adamint

README.md

@@ -15,13 +15,13 @@ This library is available via Maven Central.
 <dependency>
     <groupId>com.adamratzman</groupId>
     <artifactId>spotify-api-kotlin</artifactId>
-    <version>1.0.2</version>
+    <version>1.0.3</version>
 </dependency>
 ```
 
 ### Gradle
 ```
-compile group: 'com.adamratzman', name: 'spotify-api-kotlin', version: '1.0.1'
+compile group: 'com.adamratzman', name: 'spotify-api-kotlin', version: '1.0.3'
 ```
 
 To use the latest snapshot instead, you must add the Jitpack repository