updated install_requires in setup.py (#26)

Author: extinctsion

setup.py

@@ -14,7 +14,7 @@
     description=DESCRIPTION,
     long_description_content_type="text/markdown",
     packages=find_packages(),
-    install_requires=[],
+    install_requires=["numpy >= 1.19.5"],
     keywords=['python', 'sorting', 'beginners', 'sockets'],
     classifiers=[
         "Development Status :: 1 - Planning",