Update devDependencies

• eslint ^6.8.0 → ^7.0.0
• eslint-plugin-unicorn ^19.0.1 → ^20.0.0
• karma-jasmine-html-reporter ^1.5.3 → ^1.5.4
• lockfile-lint ^4.2.2 → ^4.3.4
• rollup ^2.9.1 → ^2.10.0