Fix url not being contructed properly

Author: msc-miguel

lib/yarn-package-manager.ts

@@ -92,7 +92,7 @@ export class YarnPackageManager extends BasePackageManager implements INodePacka
 	@exported("yarn")
 	public async getRegistryPackageData(packageName: string): Promise<any> {
 		const registry = await this.$childProcess.exec(`yarn config get registry`);
-		const url =  registry.trim() + packageName;
+		const url = `${registry.trim()}/${packageName}`;
 		this.$logger.trace(`Trying to get data from yarn registry for package ${packageName}, url is: ${url}`);
 		const responseData = (await this.$httpClient.httpRequest(url)).body;
 		this.$logger.trace(`Successfully received data from yarn registry for package ${packageName}. Response data is: ${responseData}`);