Release 1.4.0.

Signed-off-by: Jelmer Vernooij <jelmer@jelmer.uk>

Python3's RawIOBase guarantees only one syscall per read() requiring
a loop to accumulate the desired number of bytes or actually reach EOF.

TextIOBase.read does issue multiple syscalls (it must to correctly decode
partial unicode characters), but subunit unwraps that to get a binary stream,
and at least some of the time the layering is io.TextIOBase(_io.FileIO), where
_io.FileIO is a RawIOBase subclass rather than BufferedIOBase.

Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Partial-bug: #1813147

Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

Fix some issues reported by lintian

See merge request !5

Add support for new python versions and update pkg metadata

This commit updates the supported python versions for subunit to include
support for newer versions of the language 3.7 and 3.8 which have been
released since the last python-subunit release. At the same time it
takes the opportunity to update the package metadata to add more details
including the new python versions.

Check written bytes are not None before summing them to offset

Fixes lintian: homepage-field-uses-insecure-uri
See https://lintian.debian.org/tags/homepage-field-uses-insecure-uri.html for more details.

Drop unnecessary dependency on dh-autoconf.

See merge request !4

Fixes lintian: useless-autoreconf-build-depends
See https://lintian.debian.org/tags/useless-autoreconf-build-depends.html for more details.

    Helmut Grohne <helmut@subdivi.de> for the patch (Closes: #816339).

Fix some issues reported by lintian

See merge request !2

Merge branch 'master' of https://github.com/testing-cabal/subunit into fix-StreamResultToBytes-chunked-writing

Remove broken Python 2.6 travis CI job

Travis is not able to download a file required to run tests
with Python 2.6

```
Downloading archive: https://storage.googleapis.com/travis-ci-language-archives/python/binaries/ubuntu/16.04/x86_64/python-2.6.tar.bz2
0.12s$ curl -sSf -o python-2.6.tar.bz2 ${archive_url}
curl: (22) The requested URL returned error: 404 Not Found
Unable to download 2.6 archive. The archive may not exist. Please consider a different version.
```

Because purely written streams could return None instead of written
bytes, we cannot sum them to offset integer. On such case let
assume data has been written all at once.

This fixes LaunchPad [#1845631](https://bugs.launchpad.net/subunit/+bug/1845631)

Fix some issues reported by lintian

See merge request !1

Fixes lintian: upstream-metadata-file-is-missing
See https://lintian.debian.org/tags/upstream-metadata-file-is-missing.html for more details.

Fixes lintian: package-uses-old-debhelper-compat-version
See https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html for more details.

Closes: #920507
Signed-off-by: Mattia Rizzolo <mattia@debian.org>