Typescript 4 support

I’m sharing an update about support of TypeScript 3.9 / 4.0. TypeScript 3.9 was supposed to come with SQ 8.5 but this was reverted. We realized that a lot of users on SonarCloud still rely on NodeJS 8 environment to run their scans and supporting TypeScript 3.9 requests to move to NodeJS 10. We gave time to these users to move to NodeJS 10 and so supporting latest versions of TypeScript will come but after the 16th of November.