chore(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
babel-preset-gatsby	0.9.1 -> 0.10.0
gatsby (changelog)	2.29.3 -> 2.30.0
gatsby-image	2.8.0 -> 2.9.0
gatsby-plugin-feed	2.10.0 -> 2.11.0
gatsby-plugin-layout	1.7.0 -> 1.8.0
gatsby-plugin-netlify	2.8.0 -> 2.9.0
gatsby-plugin-react-helmet	3.7.0 -> 3.8.0
gatsby-plugin-sharp	2.11.2 -> 2.12.0
gatsby-plugin-typescript	2.9.0 -> 2.10.0
gatsby-remark-images	3.8.1 -> 3.9.0
gatsby-source-contentful	4.3.1 -> 4.4.0
gatsby-source-filesystem	2.8.1 -> 2.9.0
gatsby-transformer-remark	2.13.1 -> 2.14.0
gatsby-transformer-sharp	2.9.0 -> 2.10.0

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Release Notes

gatsbyjs/gatsby

### [`v0.10.0`](https://togithub.com/gatsbyjs/gatsby/releases/v0.10.0) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/v0.9.1...v0.10.0) Thanks to the efforts of [@​patrykkopycinski](https://togithub.com/patrykkopycinski), Gatsby now supports React 15. This should be an easy upgrade for most people as long as your current site is showing deprecation warnings in the console.log. [#​252](https://togithub.com/gatsbyjs/gatsby/pull/252) [@​alampros](https://togithub.com/alampros) also contributed a bug fix as he noticed that when setting the host option for `gatsby develop` and `gatsby serve-build` that the short version `-h` overrode the default help option. He changed that to `-H` so there would no longer be a conflict [#​247](https://togithub.com/gatsbyjs/gatsby/pull/247).

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