fix compile error ;/

Author: guFalcon

src/main/java/info/unterrainer/oauthtokenmanager/OauthTokenManager.java

@@ -173,8 +173,6 @@ public void getTokensFromCredentials(String clientId, String clientSecret, Strin
 log.debug("Access token: {}", json.get("access_token").asText());
 log.debug("Refresh token: {}", json.get("refresh_token").asText());
 
-return json;
-
 } catch (Exception e) {
 log.error("Error obtaining tokens from Keycloak.", e);
 throw new IllegalStateException("Unable to get token", e);