Remove virustotal.js as a dependency

lib/virustotal.js

@@ -0,0 +1,11 @@
+import fetch from 'node-fetch';
+import FormData from 'form-data';
+
+const apiRoot = 'https://www.virustotal.com/vtapi/v2';
+
+export function* getFileReport(resource, apiKey = process.env.VIRUSTOTAL_KEY) {
+  const form = new FormData();
+  form.append('apikey', apiKey);
+  form.append('resource', resource);
+  return yield fetch(`${apiRoot}/file/report`, { method: 'POST'});
+}