fix(deps): update gatsby

Author: renovate[bot]

package.json

@@ -40,32 +40,32 @@
     "classnames": "^2.2.6",
     "codecov": "^3.6.5",
     "gatsby": "^2.20.2",
-    "gatsby-link": "^2.3.0",
-    "gatsby-plugin-catch-links": "^2.2.0",
-    "gatsby-plugin-feed": "^2.4.0",
-    "gatsby-plugin-flow": "^1.2.0",
-    "gatsby-plugin-google-gtag": "^1.2.0",
-    "gatsby-plugin-manifest": "^2.3.1",
-    "gatsby-plugin-offline": "^3.1.0",
+    "gatsby-link": "^5.15.0",
+    "gatsby-plugin-catch-links": "^5.15.0",
+    "gatsby-plugin-feed": "^5.15.0",
+    "gatsby-plugin-flow": "^4.15.0",
+    "gatsby-plugin-google-gtag": "^5.15.0",
+    "gatsby-plugin-manifest": "^5.15.0",
+    "gatsby-plugin-offline": "^6.15.0",
     "gatsby-plugin-optimize-svgs": "^1.0.4",
-    "gatsby-plugin-react-helmet": "^3.2.0",
+    "gatsby-plugin-react-helmet": "^6.15.0",
     "gatsby-plugin-robots-txt": "^1.5.0",
-    "gatsby-plugin-sass": "^2.2.0",
+    "gatsby-plugin-sass": "^6.15.0",
     "gatsby-plugin-sharp": "^2.5.1",
-    "gatsby-plugin-sitemap": "^2.3.0",
-    "gatsby-remark-autolink-headers": "^2.2.0",
-    "gatsby-remark-copy-linked-files": "^2.2.0",
+    "gatsby-plugin-sitemap": "^6.15.0",
+    "gatsby-remark-autolink-headers": "^6.15.0",
+    "gatsby-remark-copy-linked-files": "^6.15.0",
     "gatsby-remark-embed-youtube": "^0.0.7",
     "gatsby-remark-external-links": "0.0.4",
-    "gatsby-remark-images": "^3.2.0",
-    "gatsby-remark-katex": "^3.2.0",
-    "gatsby-remark-prismjs": "^3.4.0",
-    "gatsby-remark-relative-images": "^0.3.0",
-    "gatsby-remark-responsive-iframe": "^2.3.0",
-    "gatsby-remark-smartypants": "^2.2.0",
-    "gatsby-source-filesystem": "^2.2.1",
+    "gatsby-remark-images": "^7.15.0",
+    "gatsby-remark-katex": "^7.15.0",
+    "gatsby-remark-prismjs": "^7.15.0",
+    "gatsby-remark-relative-images": "^2.0.5",
+    "gatsby-remark-responsive-iframe": "^6.15.0",
+    "gatsby-remark-smartypants": "^6.15.0",
+    "gatsby-source-filesystem": "^5.15.0",
     "gatsby-transformer-remark": "^2.7.0",
-    "gatsby-transformer-sharp": "^2.4.1",
+    "gatsby-transformer-sharp": "^5.15.0",
     "invariant": "^2.2.4",
     "katex": "^0.11.1",
     "lodash": "^4.17.15",
@@ -89,7 +89,7 @@
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "10.1.0",
     "babel-jest": "^25.2.3",
-    "babel-preset-gatsby": "^0.3.1",
+    "babel-preset-gatsby": "^3.15.0",
     "browserslist": "^4.11.0",
     "concurrently": "5.1.0",
     "eslint": "6.8.0",