Change PyMart dir to pymart to align with package name

Author: keviny2

PyMart/__init__.py pymart/__init__.pyPyMart/__init__.py renamed to pymart/__init__.py

@@ -1,4 +1,3 @@
-
 from setuptools import setup
 
 with open("README.md", "r") as _f:
@@ -13,7 +12,7 @@
 setup(name="PyMart",
       version="0.0.1",
       description="Python based API wrapper around Ensembl's BioMart",
-      package_dir={"pymart": "PyMart"},
+      package_dir={"pymart": "pymart"},
       long_description=long_description,
       long_description_content_type='text/markdown',
       url="https://github.com/ivanp1994/PyMart.git",