feat: add circleci version to source

Author: psirenny

src/index.js

@@ -3,3 +3,4 @@
 export { default as fetchReleases } from './code/modules/fetch-releases';
 export { default as installBinary } from './code/modules/install-binary';
 export { default as updateVersion } from './code/modules/update-version';
+export { default as version } from '../circleci-version';