core --> uppy in utils too

src/core/Utils.js

@@ -489,10 +489,10 @@ function getSocketHost (url) {
 }
 
 function _emitSocketProgress (uploader, progressData, file) {
-  const {progress, bytesUploaded, bytesTotal} = progressData
+  const { progress, bytesUploaded, bytesTotal } = progressData
   if (progress) {
-    uploader.core.log(`Upload progress: ${progress}`)
-    uploader.core.emit('upload-progress', {
+    uploader.uppy.log(`Upload progress: ${progress}`)
+    uploader.uppy.emit('upload-progress', {
       uploader,
       id: file.id,
       bytesUploaded: bytesUploaded,