Pin spaCy version to <3 (#314)

This is already specified in requirements.txt, but not in setup.py. Also
the version spec for requests looks similar, maybe it was put there by
mistake?

Author: polm

setup.py

@@ -224,8 +224,8 @@ def setup_package():
                 "numpy>=1.15.0",
                 "boto3",
                 "requests>=2.13.0,<3.0.0",
-                "spacy>=2.1.0"],
-            setup_requires=['wheel', 'spacy>=2.1.0'],
+                "spacy>=2.1.0,<3.0.0"],
+            setup_requires=['wheel', 'spacy>=2.1.0,<3.0.0'],
             python_requires=">=3.6",
             packages=PACKAGES,
             package_data=PACKAGE_DATA,