chore: export Options type (#21)

Author: adamhamlin

index.ts

@@ -1,4 +1,5 @@
 export { DeepSet } from './src/set';
 export { DeepMap } from './src/map';
 export { BiDirectionalDeepMap } from './src/map.bi-directional';
+export { Options } from './src/options';
 export { areEqual } from './src/areEqual';