Lucene 5.0 update

Change-Id: I5fa86da7e959a8394652148d78248590bb71b2a7
diff --git a/src/main/java/de/ids_mannheim/korap/query/spans/ExpandedSpans.java b/src/main/java/de/ids_mannheim/korap/query/spans/ExpandedSpans.java
index b378d43..29e8900 100644
--- a/src/main/java/de/ids_mannheim/korap/query/spans/ExpandedSpans.java
+++ b/src/main/java/de/ids_mannheim/korap/query/spans/ExpandedSpans.java
@@ -6,7 +6,7 @@
 import java.util.List;
 import java.util.Map;
 
-import org.apache.lucene.index.AtomicReaderContext;
+import org.apache.lucene.index.LeafReaderContext;
 import org.apache.lucene.index.Term;
 import org.apache.lucene.index.TermContext;
 import org.apache.lucene.util.Bits;
@@ -49,7 +49,7 @@
      * @throws IOException
      */
     public ExpandedSpans (SpanExpansionQuery spanExpansionQuery,
-                          AtomicReaderContext context, Bits acceptDocs,
+                          LeafReaderContext context, Bits acceptDocs,
                           Map<Term, TermContext> termContexts)
             throws IOException {
         super(spanExpansionQuery, context, acceptDocs, termContexts);