🚀 Feature request

Command (mark with an x)

- [x] new - [x] build - [x] serve - [x] test - [x] e2e - [x] generate - [ ] add - [ ] update - [ ] lint - [ ] xi18n - [x] run - [ ] config - [ ] help - [ ] version - [ ] doc 

Description

With the release of TypeScript 3.7, I (and I imagine many others) are eager to upgrade to the latest TypeScript version. Features like optional chaining and nullish coalescing are very compelling.

Describe the solution you'd like

Update build_angular to support TypeScript 3.7 (latest release as of this writing supports only 3.6).