Upgrade elm-example-publisher to 2.0.3 to restore Ellie links

2.0.3 fixes a decoder bug that dropped the per-example ellieLink, so the
"Edit on Ellie" links disappeared from the examples site after the 2.0
upgrade.

Author: gampleman

package-lock.json

@@ -33,7 +33,7 @@
   },
   "homepage": "https://github.com/gampleman/elm-visualization#readme",
   "devDependencies": {
-    "elm-example-publisher": "^2.0.2",
+    "elm-example-publisher": "^2.0.3",
     "netlify-plugin-cache": "^1.0.3"
   },
   "overrides": {