Set version range for `build_config` (#192)
Set version range for `build_config` (#192)

* Set version range for `build_config`

@natebosch recommended this so I am doing it. He said it's safe. He also said `pageloader` should publish a version that is compatible with the latest `build_config`

* Only add the `build_config` version range

Sorry guys

* bad merge fixed!

google/pageloader,google/pageloader,google/pageloader