This reverts commit 3dc390f.

```
  Processing ./bip_utils-1.0.5-py2-none-any.whl
  ERROR: Package 'bip-utils' requires a different Python: 2.7.18 not in '>=3.6'
```

```
  Processing ./sphinxcontrib_applehelp-1.0.2-py2.py3-none-any.whl
  ERROR: Package 'sphinxcontrib-applehelp' requires a different Python: 2.7.18 not in '>=3.5'
```

```
  Processing ./sphinxcontrib_htmlhelp-1.0.3-py2.py3-none-any.whl
  ERROR: Package 'sphinxcontrib-htmlhelp' requires a different Python: 2.7.18 not in '>=3.5
```

```
  Processing ./sphinxcontrib_serializinghtml-1.1.4-py2.py3-none-any.whl
  ERROR: Package 'sphinxcontrib-serializinghtml' requires a different Python: 2.7.18 not in '>=3.5'
```

```
  Processing ./pytest_testmon-1.0.2-py2-none-any.whl
  ERROR: Package 'pytest-testmon' requires a different Python: 2.7.18 not in '>=3.6'
```

```
  Processing ./pyvcd-0.2.3-py2.py3-none-any.whl
  ERROR: Package 'pyvcd' requires a different Python: 2.7.18 not in '>=3.6'
```

```
  Processing ./rq-1.4.3-py2.py3-none-any.whl
  ERROR: Package 'rq' requires a different Python: 2.7.18 not in '>=3.4'
```

```
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7ffff642da90>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/pytest-codestyle/
  ERROR: Could not find a version that satisfies the requirement pytest-codestyle (from versions: none)
  ERROR: No matching distribution found for pytest-codestyle
```

```
  Processing ./mox3-1.1.0-py2-none-any.whl
  ERROR: Package 'mox3' requires a different Python: 2.7.18 not in '>=3.6'
```