Please make `checkTypeScriptVersions` aggregate version mismatches

[SimonSchick]

It's rather tedious that you have to re-run the tester every time you fix a version mismatch.

I "hacked" my local installation with something like this:

function checkTypeScriptVersions(allPackages) {
    const violations = [];
    for (const pkg of allPackages.allTypings()) {
        for (const dep of allPackages.allDependencyTypings(pkg)) {
            if (dep.minTypeScriptVersion > pkg.minTypeScriptVersion) {
                violations.push({
                    dep,
                    pkg,
                });
            }
        }
    }
    if (violations.length === 0) {
        return;
    }
    throw new Error(
        violations.map(
            ({ pkg, dep }) =>
                `${pkg.desc} depends on ${dep.desc} but has a lower required TypeScript version (${dep.minTypeScriptVersion} > ${pkg.minTypeScriptVersion}).`,
        )
        .join('\n'),
    );
}

Please consider this change.