Updated npmignore to include new MD files (#3534)
diff --git a/.npmignore b/.npmignore
index aa4fd97..cece8f0 100644
--- a/.npmignore
+++ b/.npmignore
@@ -23,3 +23,5 @@ gulpfile.js
.eslintrc.js
.eslintcache
.jsdoc.json
+MAINTAINERS.md
+SECURITY.md