added interlap dependancy

setup.py

@@ -8,7 +8,7 @@
 	author_email="[email protected]",
 	description="A gene annotation mapping tool",
 	url="https://github.com/ashumate/Liftoff",
-	install_requires=['numpy==1.19.0', 'biopython==1.76', 'gffutils==0.10.1', 'networkx==2.4', 'pysam==0.16.0.1','pyfaidx==0.5.8'],
+	install_requires=['numpy==1.19.0', 'biopython==1.76', 'gffutils==0.10.1', 'networkx==2.4', 'pysam==0.16.0.1','pyfaidx==0.5.8', 'interlap==0.2.6'],
 	python_requires='>=3.0',
 	packages=['liftoff'],
 	entry_points={'console_scripts': ['liftoff = liftoff.run_liftoff:main'], },