fix(loader.js): pass spec as string to createTestsFromFeature fn

Suggested fix. Unfortunately test case still fails.

re #415

Author: ralphpulselive

lib/loader.js

@@ -11,11 +11,11 @@ const { getCucumberJsonConfig } = require("./getCucumberJsonConfig");
 const createCucumber = (filePath, cucumberJson, spec, toRequire, name) =>
   `
   ${cucumberTemplate}
-  
+
   window.cucumberJson = ${JSON.stringify(cucumberJson)};
   describe(\`${name}\`, function() {
     ${toRequire.join("\n")}
-    createTestsFromFeature('${filePath}', \`${jsStringEscape(spec)}\`);
+    createTestsFromFeature('${filePath}', '${jsStringEscape(spec)}');
   });
   `;