As we are already using the API to retrieve the pull request
title, also retrieve the base branch.
This makes sure that pull requests for 0.12 automatically end up in
0.12, and pull requests for master automatically end up in master,
and so on.
It is still possible to override the branch from the command line
or using the `githubmerge.branch` git option.
This makes github-merge.py the first developer tool to go
all Python 3 (for context see #7717).
The changes are straightforward as the script already was
`from __future__ import division,print_function,unicode_literals`.
However urllib2 changed name, and json will only accept unicode data not
bytes.
This retains py2 compatibility for now: not strictly necessary
as it's not used by the build system - but it was easy.
Use 'utf-8' instead of the Python 2 default of 'ascii' to encode/decode
commit messages.
This can be removed when switching to Python 3, as 'utf-8' is the
default there.
Necessary for merging #7422 due to the ฿ in ฿tcDrak.
This is meant to be a direct translation of the bash script,
with the difference that it retrieves the PR title from github,
thus creating pull messages like:
Merge #12345: Expose transaction temperature over RPC
