fix(deps): update gatsby

package.json

@@ -41,7 +41,7 @@
     "bluebird": "^3.7.2",
     "classnames": "^2.2.6",
     "codecov": "^3.7.2",
-    "gatsby": "^2.24.54",
+    "gatsby": "^2.24.56",
     "gatsby-link": "^2.4.13",
     "gatsby-plugin-catch-links": "^2.3.11",
     "gatsby-plugin-feed": "^2.5.11",
@@ -54,7 +54,7 @@
     "gatsby-plugin-optimize-svgs": "^1.0.4",
     "gatsby-plugin-react-helmet": "^3.3.10",
     "gatsby-plugin-sass": "^2.3.12",
-    "gatsby-plugin-sharp": "^2.6.32",
+    "gatsby-plugin-sharp": "^2.6.34",
     "gatsby-plugin-sitemap": "^2.4.12",
     "gatsby-remark-autolink-headers": "^2.3.12",
     "gatsby-remark-copy-linked-files": "^2.3.14",
@@ -65,8 +65,8 @@
     "gatsby-remark-relative-images": "^2.0.2",
     "gatsby-remark-responsive-iframe": "^2.4.13",
     "gatsby-remark-smartypants": "^2.3.10",
-    "gatsby-source-filesystem": "^2.3.28",
-    "gatsby-transformer-remark": "^2.8.33",
+    "gatsby-source-filesystem": "^2.3.29",
+    "gatsby-transformer-remark": "^2.8.34",
     "gatsby-transformer-sharp": "^2.5.14",
     "invariant": "^2.2.4",
     "katex": "^0.12.0",