Fix camel-cased xpdConf dir name in sdist

[mrakitin]

This fixes the mistaken camel-cased name brought in via #16.

Context: nsls-ii-forge/xpdconf-feedstock#4 (comment).

This is a fixed source-distribution directory structure:

$ tree xpdconf-0.4.3
xpdconf-0.4.3
├── AUTHORS.txt
├── CHANGELOG.rst
├── LICENSE
├── MANIFEST.in
├── PKG-INFO
├── README.md
├── setup.cfg
├── setup.py
├── xpdconf
│   ├── __init__.py
│   ├── conf.py
│   ├── examples
│   │   ├── pdf.yaml
│   │   ├── sim.yaml
│   │   ├── sim_db.yaml
│   │   └── xpd.yaml
│   └── tests
│       ├── __init__.py
│       ├── test_base_dir.py
│       ├── test_conf.py
│       └── test_loadyaml.py
└── xpdconf.egg-info
    ├── PKG-INFO
    ├── SOURCES.txt
    ├── dependency_links.txt
    ├── not-zip-safe
    └── top_level.txt

4 directories, 23 files

[st3107]

Thank for the fix. I should have noticed the capitalized letter,

[mrakitin]

Thank you for the quick turn-around, @st3107! I overlooked that too, no worries.