Updated the setup.py file to include the setup require Cython

Author: Lucioric2000

setup.py

@@ -225,7 +225,7 @@ def setup_package():
                 "boto3",
                 "requests>=2.13.0,<3.0.0",
                 "spacy>=2.1.0,<3.0.0"],
-            setup_requires=['wheel', 'spacy>=2.1.0,<3.0.0'],
+            setup_requires=['wheel', 'spacy>=2.1.0,<3.0.0', 'cython'],
             python_requires=">=3.6",
             packages=PACKAGES,
             package_data=PACKAGE_DATA,