Merge pull request #26 from pythonpizza/dependabot/npm_and_yarn/gatsby-2.15.19

Bump gatsby from 2.15.15 to 2.15.19

Author: marcoacierno

package.json

@@ -6,7 +6,7 @@
   "author": "Python Pizza",
   "dependencies": {
     "classnames": "^2.2.6",
-    "gatsby": "^2.15.15",
+    "gatsby": "^2.15.19",
     "gatsby-image": "^2.2.19",
     "gatsby-plugin-manifest": "^2.2.18",
     "gatsby-plugin-offline": "^3.0.6",