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Try to fix Python 3.4 builds on Travis CI

Adding the 'pip install --upgrade' option in dd53b9eef6e fixed the
Python 2.6 job on Travis CI but caused the Python 3.4 job to start
failing with an obscure error related to pkg_resources.

Searching for parts of that error message indicate that upgrading
pip and/or setuptools may help to resolve the problem.

Here's the failing job:
https://travis-ci.org/xolox/python-humanfriendly/builds/496657455

And below follows the (relevant) part of the output:

$ scripts/travis.sh pip install --constraint=constraints.txt --requirement=requirements-travis.txt --upgrade
...
Installing collected packages: six, scandir, pathlib2, more-itertools, setuptools, attrs, pluggy, py, atomicwrites, pytest, coverage, pytest-cov, pycodestyle, typing, mccabe, entrypoints, pyflakes, flake8, snowballstemmer, pydocstyle, flake8-polyfill, flake8-docstrings, humanfriendly, capturer, coloredlogs, docopt, urllib3, certifi, chardet, idna, requests, coveralls
  Found existing installation: six 1.10.0
    Uninstalling six-1.10.0:
      Successfully uninstalled six-1.10.0
  Rolling back uninstall of six

Exception:
Traceback (most recent call last):
  File "$VIRTUAL_ENV/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2813, in _dep_map
    return self.__dep_map
  File "$VIRTUAL_ENV/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2624, in __getattr__
    raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "$VIRTUAL_ENV/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2804, in _parsed_pkg_info
    return self._pkg_info
  File "$VIRTUAL_ENV/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2624, in __getattr__
    raise AttributeError(attr)
AttributeError: _pkg_info

During handling of the above exception, another exception occurred:

Traceback (most recent call last)... (continued)

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