Format BUILD file with buildifier

Change-Id: I1c6b062af5ee3d56011aeb830ec206abe476afbe
diff --git a/BUILD b/BUILD
index db616d8..3428c43 100644
--- a/BUILD
+++ b/BUILD
@@ -46,9 +46,9 @@
     exports = [
         "@autolink//jar",
         "@cm-autolink//jar",
-        "@commons-text//jar",
         "@commonmark//jar",
         "@commons-lang3//jar",
+        "@commons-text//jar",
         "@gfm-strikethrough//jar",
         "@gfm-tables//jar",
         "@gitiles-servlet//jar",