Merge pull request #180 from unsplash/maintenance/export-topics

Maintenance/export topic methods

src/internals.ts

@@ -1,7 +1,8 @@
 import * as collections from './methods/collections';
 import * as photos from './methods/photos';
 import * as search from './methods/search';
+import * as topics from './methods/topics';
 import * as users from './methods/users';
 export { trackNonHotLinkedPhotoView } from './beacon';
 
-export { collections, photos, search, users };
+export { collections, photos, search, users, topics };