chore: Manual eslint/style fixes

.eslintrc.js

cli.js

lib/header.js

lib/main.js

lib/markdownWriter.js

lib/prettyMarkdown.js

lib/readSchemaFile.js

lib/readmeWriter.js

lib/schema.js

lib/schemaWriter.js

lib/writeFiles.js

spec/lib/header.spec.js

spec/lib/integrationTest.spec.js