Update all Yarn dependencies (2019-09-12)

[depfu[bot]]

This is your daily update of all Yarn dependencies. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ eslint (6.2.2 → 6.3.0, minor) · Repo · Changelog · Release · Diff

✳️ flow-bin (0.106.1 → 0.106.3, minor) · Repo · Diff

✳️ gatsby (2.13.83 → 2.15.14, minor) · Repo · Changelog

✳️ history (4.9.0 → 4.10.0, minor) · Repo · Changelog · Release · Diff

✳️ @mdx-js/loader (1.4.0 → 1.4.5, patch) · Repo · Changelog · Release · Diff

✳️ @mdx-js/mdx (1.4.0 → 1.4.5, patch) · Repo · Changelog · Release · Diff

✳️ babel-plugin-emotion (10.0.16 → 10.0.17, patch) · Repo · Changelog

✳️ gatsby-image (2.2.14 → 2.2.18, patch) · Repo · Changelog

✳️ gatsby-plugin-canonical-urls (2.1.5 → 2.1.7, patch) · Repo · Changelog

✳️ gatsby-plugin-catch-links (2.1.5 → 2.1.9, patch) · Repo · Changelog

✳️ gatsby-plugin-flow (1.1.4 → 1.1.6, patch) · Repo · Changelog

✳️ gatsby-plugin-google-analytics (2.1.11 → 2.1.16, patch) · Repo · Changelog

✳️ gatsby-plugin-manifest (2.2.9 → 2.2.16, patch) · Repo · Changelog

✳️ gatsby-plugin-netlify (2.1.10 → 2.1.12, patch) · Repo · Changelog

✳️ gatsby-plugin-sitemap (2.2.9 → 2.2.12, patch) · Repo · Changelog

✳️ gatsby-plugin-styled-components (3.1.3 → 3.1.5, patch) · Repo · Changelog

✳️ gatsby-remark-images (3.1.19 → 3.1.21, patch) · Repo · Changelog

✳️ gatsby-remark-images-contentful (2.1.10 → 2.1.12, patch) · Repo · Changelog

✳️ gatsby-remark-responsive-iframe (2.2.9 → 2.2.16, patch) · Repo · Changelog

✳️ gatsby-source-contentful (2.1.29 → 2.1.35, patch) · Repo · Changelog

✳️ gatsby-source-filesystem (2.1.18 → 2.1.22, patch) · Repo · Changelog

✳️ gatsby-transformer-remark (2.6.19 → 2.6.22, patch) · Repo · Changelog

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