[Snyk] Security upgrade react-scripts from 3.0.0 to 3.1.0

[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:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ACORN-559469	No	No Known Exploit

Commit messages

Package name: react-scripts

The new version differs by 86 commits.

• a78ff74 Publish
• dbe7967 Prepare 3.1.0 release
• f09d3d3 Remove unused dependencies in babel-preset-react-app (#5818)
• 538943f Add readonly modifier for css module (#7497)
• a48a054 Bump version of sass-loader (#7496)
• b225842 Add vscodium to the editor list (#7028)
• cb2c720 Fix launch.json debugging config (#6484)
• efaee65 Fix RegExp from navigateFallbackBlacklist (workbox) (#7176)
• 9678bbb Support configuring coveragePathIgnorePatterns (#7080)
• 91c2673 Bump dependencies (#7473)
• cff4046 Adjusted deployment documentation for ZEIT Now (#7488)
• eaf0b17 Fix HMR in Firefox when proxy option present (#7444)
• ea2bcb7 Use readConfigFile instead of require for tsconfig (#7248)
• 65a891c Optimise templates for Lighthouse (#7482)
• ae671dc Specify roots in Jest config (#7480)
• 914c95e Resolve relative paths for preprocessor styles (#5829)
• 066053c Set jsonpFunction to prevent conflicts (#5951)
• 30fc0bf Suggest `jsx: "react"` in tsconfig (#7472)
• 032cdf7 Improve bootstrap docs when using custom SCSS (#7462)
• b96ac6c Update ESlint Install Docs (#7451)
• 567f36c Update testing-library package names in README (#7340)
• 404af90 Add ESLint 6 support (#7415)
• cbad256 Add explicit check for --watchAll=false (#7433)
• 67a2088 Remove labels from pull request template

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