[Snyk] Security upgrade gatsby from 2.0.76 to 2.1.1

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	611/1000 Why? Recently disclosed, Has a fix available, CVSS 6.5	Information Exposure SNYK-JS-NODEFETCH-2342118	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: gatsby

The new version differs by 250 commits.

• ba46e99 chore(release): Publish
• 8494a1b Move to @ gatsbyjs scoped version of yarn (#11759)
• 67c0131 fix(blog): 2019-01-01 json code blocks (#11750)
• d1ae7ab fix(starters): update dependency gatsby to ^2.1.0 (#11745)
• 03fae48 fix(starters): update dependency prop-types to ^15.7.2 (#11748)
• 5e7899c feat(showcase): add Incremental.com.au (#11729)
• 8f7f8cd feat(starters): add starter magicsoup.io (#11670)
• bb147bd docs(gatsby): Add documentation for useStaticQuery (#11741)
• 9896fa0 chore(release): Publish
• f149c4c feat(gatsby): add useStaticQuery hook (#11588)
• a68769d chore(release): Publish
• 0caea8b chore(docs): reword CSS in JS docs for clarity (#11439)
• 67daa2d chore: Upgrade Prettier related packages to the latest (#11735)
• 8a6db6a fix(core): added event source polyfill in develop to fix IE/edge hmr (#11582)
• 3024839 chore: minify svg husky hook (#10560)
• 22c41fb docs: add videos for Gatsby Link + rewrite for flow (#11700)
• 0baa034 docs: add egghead lesson to quickstart (#11699)
• 3198ca5 Update sites.yml (#11713)
• 5dc5640 fix(starters): update dependency gatsby-transformer-remark to ^2.2.5 (#11718)
• fadd172 fix(starters): clean up redundant/incorrect tags
• 41b4f89 chore(release): Publish
• 29dee3f fix(gatsby-transformer-remark): restore behavior of serializing date-like fields to string (#11716)
• 128b156 chore: fix circle ci workflow (#11715)
• bab4eae Docs/client search with js search (#11505)

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