HtmlWebpackPlugin 4 Support

• HtmlWebpackPlugin 4 support (Finally merged in PR #23) from @sibiraj-s
• Addition of new additionalOption: devAllowUnsafe to allow unsafe-inline and unsafe-eval to still be present in the generated policy, even if the dev specifies unsafe-inline/eval in their own policy from @AnujRNair

Small Feature Additions

• Add meta tag if it doesn't exist by @Daniel-Khodabakhsh
• Add option to skip hashing if unsafe-inline is present by @swac
• Disable the plugin from HTMLWebpackPlugin by @sibiraj-s

Webpack 4 compatibility & bug fixes

• Allow string values for script and style CSP policies by @wanecek
• Add .prettierrc config file by @wanecek
• Webpack 4 compatibility by @ScottRocha