[Snyk] Security upgrade gatsby from 1.9.279 to 2.0.0

[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:
  • examples/using-page-transitions/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Denial of Service (DoS) SNYK-JS-JSYAML-173999	Yes	No Known Exploit
	Arbitrary Code Execution SNYK-JS-JSYAML-174129	Yes	No Known Exploit
	Prototype Pollution SNYK-JS-LODASH-450202	Yes	Proof of Concept
	Prototype Pollution SNYK-JS-LODASH-73638	Yes	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-73639	Yes	No Known Exploit
	Directory Traversal SNYK-JS-SERVE-174738	Yes	No Known Exploit
	Information Exposure SNYK-JS-SERVEHANDLER-450208	Yes	No Known Exploit
	Cross-site Scripting (XSS) SNYK-JS-SERVEHANDLER-72615	Yes	No Known Exploit
	Information Exposure SNYK-JS-WEBPACKDEVSERVER-72405	Yes	No Known Exploit
	Regular Expression Denial of Service (ReDoS) npm:braces:20180219	Yes	Proof of Concept
	Prototype Pollution npm:lodash:20180130	Yes	No Known Exploit

Check the changes in this PR to ensure they won't cause issues with your project.

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