In 1.0.2, Spina no longer had a dependency on

rollup-plugin-external-globals, but still imported it (unused). That

import has been removed.
It also no longer defined globalsMap, due to an overzealous removal of

lines. This brings it back.

Cleared out node_modules and ran npm run build. Had successful results

without any errors or warnings.
Inspected lib/index.js to make sure the UMD wrapper was set up correctly.