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Drop support for EOL Python 3.4

Python 3.4 is end-of-life. It is no longer receiving bug fixes,
including for security issues. Python 3.4 went EOL on March 18, 2019.

Supported: https://devguide.python.org/#status-of-python-branches
EOL: https://devguide.python.org/devcycle/#end-of-life-branches

Right now, testing on Python 3.4 fails with the error:

    ImportError: Twisted on Python 3 requires Python 3.5 or later.

Rather than spend time maintaining, skipping or fixing this test, remove
the end-of-life support to reduce testing time and maintenance.

Using pypinfo, we can see the PyPI download statistics for tblib from
the last month, which show low numbers for Python 3.4.

| python_version | percent | download_count |
| -------------- | ------: | -------------: |
| 3.6            |  58.72% |        435,682 |
| 2.7            |  17.55% |        130,204 |
| 3.7            |  11.91% |         88,401 |
| 3.5            |  11.59% |         85,975 |
| 3.4            |   0.18% |          1,322 |
| 3.8            |   0.05% |            385 |
| 2.6            |   0.00% |             28 |
| 3.3            |   0.00% |              3 |
| Total          |         |        742,000 |

Python 3.4 users can continue installing older releases of tblib. Using
python_requires ensures pip users will install a compatible version with
the need to pin it.

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