extensions/git/src/git.ts/Git/stream
class Git:	stream(cwd: string, args: string[], options: SpawnOptions = {}): cp.ChildProcess {
		options = assign({ cwd }, options || {});
		const child = this.spawn(args, options);

		if (options.log !== false) {
			const startTime = Date.now();
			child.on('exit', (_) => {
				this.log(`> git ${args.join(' ')} [${Date.now() - startTime}ms]${child.killed ? ' (cancelled)' : ''}\n`);
			});
		}

		return child;
	}