Merge pull request #488 from pythonpizza/dependabot/npm_and_yarn/gatsby-transformer-sharp-2.5.7

Bump gatsby-transformer-sharp from 2.2.21 to 2.5.7

Author: marcoacierno

package.json

@@ -14,7 +14,7 @@
     "gatsby-plugin-react-helmet": "^3.1.21",
     "gatsby-plugin-sharp": "^2.2.27",
     "gatsby-source-filesystem": "^2.1.57",
-    "gatsby-transformer-sharp": "^2.2.21",
+    "gatsby-transformer-sharp": "^2.5.7",
     "gatsby-transformer-yaml": "^2.2.12",
     "postcss-custom-media": "^7.0.8",
     "postcss-nested": "^4.1.2",