build: update dependencies

package.json

@@ -81,20 +81,20 @@
     "dlv": "~1.1.3",
     "exists-file": "~3.0.2",
     "flat": "~5.0.2",
-    "gatsby": "~3.8.0",
+    "gatsby": "~3.9.0",
     "gatsby-plugin-advanced-sitemap": "~2.0.0",
-    "gatsby-plugin-canonical-urls": "~3.8.0",
-    "gatsby-plugin-catch-links": "~3.8.0",
-    "gatsby-plugin-google-analytics": "~3.8.0",
-    "gatsby-plugin-react-helmet": "~4.8.0",
-    "gatsby-plugin-remove-trailing-slashes": "~3.8.0",
-    "gatsby-plugin-sass": "~4.8.0",
-    "gatsby-plugin-styled-components": "~4.8.0",
-    "gatsby-source-filesystem": "~3.8.0",
-    "gatsby-transformer-javascript-frontmatter": "~3.8.0",
-    "gatsby-transformer-json": "~3.8.0",
-    "gatsby-transformer-remark": "~4.5.0",
-    "gatsby-transformer-yaml": "~3.8.0",
+    "gatsby-plugin-canonical-urls": "~3.9.0",
+    "gatsby-plugin-catch-links": "~3.9.0",
+    "gatsby-plugin-google-analytics": "~3.9.0",
+    "gatsby-plugin-react-helmet": "~4.9.0",
+    "gatsby-plugin-remove-trailing-slashes": "~3.9.0",
+    "gatsby-plugin-sass": "~4.9.0",
+    "gatsby-plugin-styled-components": "~4.9.0",
+    "gatsby-source-filesystem": "~3.9.0",
+    "gatsby-transformer-javascript-frontmatter": "~3.9.0",
+    "gatsby-transformer-json": "~3.9.0",
+    "gatsby-transformer-remark": "~4.6.0",
+    "gatsby-transformer-yaml": "~3.9.0",
     "git-jiggy": "~1.1.1",
     "github-slugger": "~1.3.0",
     "got": "~11.8.2",