Update dependency frontmatter-markdown-loader to v3.7.0

Author: renovate-bot

package-lock.json

@@ -8,7 +8,7 @@
   "dependencies": {
     "@nuxtjs/google-analytics": "2.4.0",
     "@nuxtjs/svg-sprite": "0.5.2",
-    "frontmatter-markdown-loader": "3.6.2",
+    "frontmatter-markdown-loader": "3.7.0",
     "medium-zoom": "1.0.6",
     "normalize.css": "8.0.1",
     "nuxt": "2.15.7",