Fix package deprecation warnings

[brandonocasey]

Dependencies and their chain, dependency with issue in bold

• [x] circular-json ->
  • [x] flat-entry-cache -> eslint -> videojs-standard: see https://github.com/eslint/eslint/issues/11257
  • [x] log4js -> karma: see https://github.com/log4js-node/log4js-node/issues/789
• [x] tsml -> video.js: see https://github.com/videojs/video.js/pull/6174
• [x] videojs-generate-karma-config@5.2.0
• [x] text-encoding -> sinon: fixed in 7.0.0 of sinon.
• [ ] nomnom -> jsonlint -> eslint-plugin-json-light -> videojs-standard: see https://github.com/zaach/jsonlint/pull/117
• [x] turbocolor -> postcss-progress -> videojs-generate-postcss-config: fixed in 1.1.1 of postcss-progress and 2.1.0 of videojs-generate-postcss-config

[LoneRifle]

log4js-node/log4js-node#789 has now been merged