Merge pull request #172 from Financial-Times/add-volta-to-engines-search

Also search for Volta object when searching for engines value

lib/ebi/package-engines-search.js

@@ -30,7 +30,7 @@ const getJson = ({ filepath, repository }) => data => {
 };
 
 const throwIfNoEngines = ({ filepath, repository }) => (json = {}) => {
-	const { engines } = json;
+	const engines = json.engines || json.volta;
 	if (!engines) {
 		throw new Error(
 			`INFO: engines field not found in '${filepath}' in '${repository}'`