Move to clang-format-6.0

The docker image moved from clang-format-5.0 to clang-format-6.0.

Change-Id: I3c615d7df1f21569531b4dc2cb0bc4f425cb43f8
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/format-code.sh b/format-code.sh
index 0a6362c..afcf8c4 100755
--- a/format-code.sh
+++ b/format-code.sh
@@ -18,6 +18,6 @@
 # formatting due to some imported code in webui
 
 if [ -f ".clang-format" ]; then
-    clang-format-5.0 -i `git ls-files '*.js'`
+    clang-format-6.0 -i `git ls-files '*.js'`
     git --no-pager diff --exit-code
 fi