Replaced absoluteURL with relative url (resolved #27), improving performance.

- renamed `DropboxFileProvider.copyItem(path:toRemoteURL:) ` to `DropboxFileProvider.copyItem(remoteURL:toPath:)` due to logic

FileProvider.podspec

@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
   #
 
   s.name         = "FileProvider"
-  s.version      = "0.11.0"
+  s.version      = "0.11.1"
   s.summary      = "FileManager replacement for Local and Remote (WebDAV/Dropbox/OneDrive/SMB2) files on iOS and macOS."
 
   # This description is used to generate tags and improve search results.