Update gatsby to the latest version 🚀

[greenkeeper[bot]]

There have been updates to the gatsby monorepo:

• The dependency gatsby-image was updated from 2.0.19 to 2.0.20.
• The dependency gatsby-plugin-manifest was updated from 2.0.8 to 2.0.9.
• The dependency gatsby-plugin-offline was updated from 2.0.15 to 2.0.16.
• The dependency gatsby-plugin-react-helmet was updated from 3.0.1 to 3.0.2.
• The dependency gatsby-plugin-sharp was updated from 2.0.12 to 2.0.13.
• The dependency gatsby-plugin-styled-components was updated from 3.0.2 to 3.0.3.
• The dependency gatsby-remark-images was updated from 2.0.6 to 3.0.0.
• The dependency gatsby-source-filesystem was updated from 2.0.7 to 2.0.8.
• The dependency gatsby-transformer-remark was updated from 2.1.11 to 2.1.12.
• The dependency gatsby-transformer-sharp was updated from 2.1.7 to 2.1.8.
• The dependency gatsby-transformer-yaml was updated from 2.1.4 to 2.1.5.
• The dependency gatsby was updated from 2.0.53 to 2.0.54.

These versions are not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

This monorepo update includes releases of one or more dependencies which all belong to the gatsby group definition.

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[Find out more about this release]().

FAQ and help

There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).

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Your Greenkeeper bot :palm_tree:

[greenkeeper[bot]]

• The dependency gatsby-image was updated from 2.0.19 to 2.0.20.
• The dependency gatsby-plugin-manifest was updated from 2.0.8 to 2.0.9.
• The dependency gatsby-plugin-offline was updated from 2.0.15 to 2.0.16.
• The dependency gatsby-plugin-react-helmet was updated from 3.0.1 to 3.0.2.
• The dependency gatsby-plugin-sharp was updated from 2.0.12 to 2.0.13.
• The dependency gatsby-plugin-styled-components was updated from 3.0.2 to 3.0.3.
• The dependency gatsby-remark-images was updated from 2.0.6 to 3.0.0.
• The dependency gatsby-source-filesystem was updated from 2.0.7 to 2.0.8.
• The dependency gatsby-transformer-remark was updated from 2.1.11 to 2.1.12.
• The dependency gatsby-transformer-sharp was updated from 2.1.7 to 2.1.8.
• The dependency gatsby-transformer-yaml was updated from 2.1.4 to 2.1.5.
• The dependency gatsby was updated from 2.0.53 to 2.0.54.

Update to these versions instead 🚀