Added numpy requirement

setup.py

@@ -33,5 +33,5 @@ setuptools.setup(
     package_dir={"": "src"},
     packages=setuptools.find_packages(where="src"),
     python_requires=">=3.8",
-    install_requires=['pexpect', 'wexpect', 'pybtex', 'snipper'],
+    install_requires=['pexpect', 'wexpect', 'pybtex', 'numpy'],
 )