updated browser-sync to fix audit

Author: nmetulev

package.json

@@ -64,7 +64,7 @@
     "@types/jest": "^24.0.11",
     "@webcomponents/webcomponentsjs": "^2.2.10",
     "babel-polyfill": "6.26.0",
-    "browser-sync": "^2.26.5",
+    "browser-sync": "^2.26.7",
     "cpx": "^1.5.0",
     "gulp": "^4.0.0",
     "gulp-append-prepend": "^1.0.6",