chore(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
babel-preset-gatsby	devDependencies	minor	0.4.12 -> 0.5.1
gatsby (changelog)	dependencies	patch	2.23.12 -> 2.23.20
gatsby-image	dependencies	patch	2.4.9 -> 2.4.12
gatsby-plugin-canonical-urls	dependencies	patch	2.3.6 -> 2.3.9
gatsby-plugin-layout	dependencies	patch	1.3.6 -> 1.3.9
gatsby-plugin-manifest	dependencies	patch	2.4.14 -> 2.4.17
gatsby-plugin-offline	dependencies	patch	3.2.13 -> 3.2.16
gatsby-plugin-react-helmet	dependencies	patch	3.3.6 -> 3.3.9
gatsby-plugin-sharp	dependencies	patch	2.6.14 -> 2.6.17
gatsby-plugin-sitemap	dependencies	patch	2.4.7 -> 2.4.10
gatsby-source-filesystem	dependencies	patch	2.3.14 -> 2.3.18
gatsby-transformer-sharp	dependencies	patch	2.5.7 -> 2.5.10

---

Release Notes

gatsbyjs/gatsby

### [`v0.5.1`](https://togithub.com/gatsbyjs/gatsby/compare/v0.5.0...e623913b2cf9a6fc2894b2c3bf0ebe0f6d8ecb1a) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/v0.5.0...e623913b2cf9a6fc2894b2c3bf0ebe0f6d8ecb1a) ### [`v0.5.0`](https://togithub.com/gatsbyjs/gatsby/compare/0005a1f2c905e4037aa9815605360688767b5e2e...v0.5.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/0005a1f2c905e4037aa9815605360688767b5e2e...v0.5.0)

---

Renovate configuration

:date: Schedule: "every weekend" (UTC).

:vertical_traffic_light: Automerge: Enabled.

:recycle: Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

:ghost: Immortal: This PR will be recreated if closed unmerged. Get config help if that's undesired.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by WhiteSource Renovate. View repository job log here.

[netlify[bot]]

Preview deployed with success. Look for the URL in Details.

Built with commit a299aa131503203bb22e8e5b8e06c81c4c814a59

https://deploy-preview-262--multei.netlify.app

[codecov[bot]]

Codecov Report

Merging #262 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #262   +/-   ##
=======================================
  Coverage   58.10%   58.10%           
=======================================
  Files          50       50           
  Lines         401      401           
  Branches       44       44           
=======================================
  Hits          233      233           
  Misses        144      144           
  Partials       24       24           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 5dccb79...a299aa1. Read the comment docs.