v2.1.0 - Support chain-case styles in CSP directives

• Add support for Node.js 14 #36 - @jagaapple
• Add support for chain-case directive styles to CSP #40 - @jagaapple
• Fix readme #37 - @jagaapple
• Fix invalid bin field warning #39 - @jagaapple
• Fix report-to directive #38
  • Fix parse processes
  • Fix invalid value like undefined <directive-name> when report-uri or report-to is specified
• Improve development environment
  • Update dependencies #34 - @jagaapple
  • Change Node.js version in development #34 - @jagaapple