add expected blank line to top of license to placate rcverify.sh (#128)

diff --git a/LICENSE.txt b/LICENSE.txt
index 261eeb9..d645695 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,3 +1,4 @@
+
                                  Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/