chore(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
babel-preset-gatsby	devDependencies	minor	0.3.6 -> 0.4.0
gatsby (changelog)	dependencies	minor	2.20.36 -> 2.21.9
gatsby-image	dependencies	minor	2.3.5 -> 2.4.0
gatsby-plugin-canonical-urls	dependencies	minor	2.2.4 -> 2.3.0
gatsby-plugin-layout	dependencies	minor	1.2.4 -> 1.3.0
gatsby-plugin-manifest	dependencies	minor	2.3.7 -> 2.4.1
gatsby-plugin-offline	dependencies	minor	3.1.5 -> 3.2.0
gatsby-plugin-react-helmet	dependencies	minor	3.2.5 -> 3.3.0
gatsby-plugin-sharp	dependencies	minor	2.5.7 -> 2.6.0
gatsby-source-filesystem	dependencies	minor	2.2.5 -> 2.3.0
gatsby-transformer-sharp	dependencies	minor	2.4.7 -> 2.5.0

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Release Notes

gatsbyjs/gatsby

### [`v0.4.0`](https://togithub.com/gatsbyjs/gatsby/releases/0.4.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/c67221403d005b0e580868937476abdc7378d243...fb92ede949f67c16a247ea5b0bc96934f0534dd2) [@​fson](https://togithub.com/fson) added SVG support to the Webpack config in [#​34](https://togithub.com/gatsbyjs/gatsby/issues/34)

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Codecov Report

Merging #169 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #169   +/-   ##
=======================================
  Coverage   90.00%   90.00%           
=======================================
  Files           4        4           
  Lines          20       20           
  Branches        2        2           
=======================================
  Hits           18       18           
  Misses          2        2           

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