Remove unused import

Author: komamitsu

msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackParserTest.java

@@ -52,7 +52,6 @@
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
-import static org.hamcrest.core.IsInstanceOf.instanceOf;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;