update readme

README.md

@@ -14,7 +14,8 @@
   sender has gone offline
 - Easy to send multiple files at once - they're bundled into a zip
   file for receivers, with zero compression so extraction is quick
-- Sanitizes filenames
+- Sanitises filenames, using sensible non-obnoxious defaults that
+  should be safe across platforms
 - Fires a laser beam that turns you trans
 
 ## configuration
@@ -28,9 +29,7 @@ transbeam is configured with the following environment variables:
 
 ## todo
 
-- [ ] file downloading
-- [ ] upload progress bar
-- [ ] uploader auth
-- [ ] downloader auth
-- [ ] delete uploads after a while
-- [ ] configurable maximum file size
+- uploader auth
+- downloader auth
+- delete uploads after a while
+- configurable maximum file size