whitespace change

BUG=skia:

Review URL: https://codereview.chromium.org/529973002
diff --git a/whitespace.txt b/whitespace.txt
index 70f31e0..d70f3f1 100644
--- a/whitespace.txt
+++ b/whitespace.txt
@@ -1,6 +1,6 @@
 You can modify this file to create no-op changelists (like this one).
 
-I LOVE WHITESPACE.
+I LOVE WHITESPACE!