get-files: fix ignored directories

lib/get-files.js

@@ -53,6 +53,12 @@ export default async function getFiles (path, pkg) {
 
 const ignoredFilter = (ignored) => (file) => {
   return !ignored.some((test) => {
+    // test that the target file is not under
+    // an ignored directory
+    const dir = test + '/';
+    if (file.substr(0, dir.length) === dir) return true;
+
+    // if not match wildcards
     return minimatch(file, test);
   });
 };