`find-latest-release.js` is used in
`scripts/check-api-compatibility.sh`. `check-api-compatibility` reads
the version from the `console.log` in `find-latest-release.js`.

When there are API rate limit errors we are logging a message about
sleeping which is what `check-api-compatibility` is seeing as the
version. For example, this is a log message from a PR build

```
Listing jsii packages...
lerna notice cli v4.0.0
lerna info ci enabled
lerna success found 252 packages
Filtering on existing packages on NPM...
Determining baseline version...
Build version:    1.152.0.
Released version: Sleeping for 58 seconds
1.152.0.
Using version 'Sleeping for 58 seconds
1.152.0' as the baseline...
for: -c: line 0: unexpected EOF while looking for matching `"'
for: -c: line 1: syntax error: unexpected end of file
for: -c: line 0: unexpected EOF while looking for matching `"'
for: -c: line 1: syntax error: unexpected end of file
```


----

### All Submissions:

* [ ] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*