2.6.0

Added

• Add the ability for --filename to accept a directory. The client will upload the file
  in that directory only if it contains a single file.
• Add more details to error messages if the client fails to read a directory or trace
  file.

Changed

• Make --trace-name optional. If not provided, the server will pick the name for the
  newly uploaded trace. This is useful because trace names must be unique within a project
  on the server, and users may not know what names are already taken.