use engine.io-client.java 0.1.1

pom.xml

@@ -57,7 +57,7 @@
     <dependency>
       <groupId>com.github.nkzawa</groupId>
       <artifactId>engine.io-client</artifactId>
-      <version>0.1.0-SNAPSHOT</version>
+      <version>0.1.1-snapshot</version>
     </dependency>
     <dependency>
       <groupId>com.google.code.gson</groupId>

src/main/java/com/github/nkzawa/socketio/client/Engine.java

@@ -16,4 +16,7 @@ class Engine extends com.github.nkzawa.engineio.client.Socket {
 
     @Override
     public void onclose() {}
+
+    @Override
+    public void onerror(Exception err) {}
 }