Remove unused import

Author: komamitsu

msgpack-jackson/src/main/java/org/msgpack/jackson/dataformat/MessagePackGenerator.java

@@ -25,7 +25,6 @@
 import org.msgpack.core.MessagePack;
 import org.msgpack.core.MessagePacker;
 import org.msgpack.core.buffer.OutputStreamBufferOutput;
-import org.msgpack.value.FloatValue;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;