create release type enum

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tmdb-ts",
-  "version": "0.0.9",
+  "version": "0.0.10",
   "description": "TMDB v3 library wrapper",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/types/movies.ts

@@ -28,12 +28,20 @@ export interface MovieDetails {
   vote_count: number;
 }
 
+export enum ReleaseDateType {
+  'Premiere' = 1,
+  'Theatrical (limited)',
+  'Theatrical',
+  'Digital',
+  'Physical',
+  'TV'
+}
 
 export interface ReleaseDate {
   certification: string;
   iso_639_1: string;
   release_date: Date;
-  type: number;
+  type: ReleaseDateType;
   note: string;
 }