Use package.json version as version for the swagger

src/main.ts

@@ -20,7 +20,7 @@ async function bootstrap() {
     .setBasePath('')
     .setTitle('Email service API')
     .setDescription('Service providing the method to send emails.')
-    .setVersion('0.1')
+    .setVersion(process.env.npm_package_version)
     .addTag('email')
     .build();
   const document = SwaggerModule.createDocument(app, options);