Update metalsmith-yearly-pagination to v4.0.0.

Author: XhmikosR

package-lock.json

@@ -54,7 +54,7 @@
     "metalsmith-permalinks": "^2.2.0",
     "metalsmith-prism": "^3.1.1",
     "metalsmith-stylus": "^3.0.0",
-    "metalsmith-yearly-pagination": "^3.0.0",
+    "metalsmith-yearly-pagination": "^4.0.0",
     "ncp": "^2.0.0",
     "node-version-data": "^1.1.0",
     "npm-run-all": "^4.1.5",