Since v0.11

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* Added a new pastebin_helper config option to name an executable that should

perform pastebin upload on bpython's behalf. If set, this overrides

pastebin_url. Data is supplied to the helper via STDIN, and it is expected

to return a pastebin URL as the first word of its output.

* Fixed a bug causing pastebin upload to fail after a previous attempt was

unsuccessful. A duplicate pastebin error would be displayed in this case,

despite the original upload having failed.