aws-s3: Add companion-client dependency.

packages/@uppy/aws-s3/package.json

@@ -25,6 +25,7 @@
   "dependencies": {
     "@uppy/utils": "0.27.1",
     "@uppy/xhr-upload": "0.27.4",
+    "@uppy/companion-client": "0.27.2",
     "resolve-url": "^0.2.1"
   },
   "devDependencies": {