Update dependencies

@babel/core                                  7.9.0  →    7.9.6
 @babel/plugin-proposal-object-rest-spread    7.9.0  →    7.9.6
 @babel/preset-env                            7.9.0  →    7.9.6
 acorn                                       ^7.1.1  →   ^7.2.0
 autoprefixer                                ^9.7.5  →   ^9.8.0
 chokidar                                    ^3.3.1  →   ^3.4.0
 gulp-sass                                   ^4.0.2  →   ^4.1.0
 js-yaml                                    ^3.13.1  →  ^3.14.0
 node-notifier                               ^6.0.0  →   ^7.0.1
 node-sass                                  ^4.13.1  →  ^4.14.1
 pug                                         ^2.0.4  →   ^3.0.0
 semver                                      ^7.1.3  →   ^7.3.2
 sharp                                      ^0.25.2  →  ^0.25.3
 svelte                                     ^3.20.1  →  ^3.22.3
 ts-loader                                   ^6.2.2  →   ^7.0.5
 typescript                                   3.8.3  →    3.9.3
 webpack                                    ^4.42.1  →  ^4.43.0
 mocha                                       ^7.1.1  →   ^7.2.0