Update oauth package and ignore linting for it

OAuth2 isnt used therefore we can ignore it

client/build.gradle

@@ -93,7 +93,7 @@ if(hasProperty('target') && target == 'android') {
 }
 
 ext {
-    oltu_version = "1.0.0"
+    oltu_version = "1.0.2"
     retrofit_version = "2.3.0"
     swagger_annotations_version = "1.5.15"
     junit_version = "4.12"
@@ -106,7 +106,9 @@ dependencies {
     compile "com.squareup.retrofit2:converter-scalars:$retrofit_version"
     compile "com.squareup.retrofit2:converter-gson:$retrofit_version"
     compile "io.swagger:swagger-annotations:$swagger_annotations_version"
-    compile "org.apache.oltu.oauth2:org.apache.oltu.oauth2.client:$oltu_version"
+    compile ("org.apache.oltu.oauth2:org.apache.oltu.oauth2.client:$oltu_version") {
+        exclude group:'org.apache.oltu.oauth2' , module: 'org.apache.oltu.oauth2.common'
+    }
     compile "io.gsonfire:gson-fire:$json_fire_version"
     compile "org.threeten:threetenbp:$threetenbp_version"
     testCompile "junit:junit:$junit_version"

client/src/main/java/com/github/gotify/client/auth/OAuthOkHttpClient.java

@@ -59,6 +59,7 @@ public class OAuthOkHttpClient implements HttpClient {
                     response.body().string(), 
                     response.body().contentType().toString(),
                     response.code(),
+                    response.headers().toMultimap(),
                     responseClass);
         } catch (IOException e) {
             throw new OAuthSystemException(e);