Removing redundant and inconsistent packages

setup.py

@@ -6,21 +6,20 @@ with open("README.md", "r") as fh:
 setuptools.setup(
     name="jupyter-rdfify",
     version="1.0.2",
-    author="Lars Pieschel",
-    author_email="lars.pieschel@rwth-aachen.de",
+    author="Lars Pieschel and Md. Rezaul Karim",
+    author_email="lars.pieschel@rwth-aachen.de/rezaul.karim@rwth-aachen.de",
     description="IPython Extension for semantic web technology support (Turtle, SPARQL, ShEx, etc.)",
     long_description=long_description,
     long_description_content_type="text/markdown",
     url="https://github.com/SemWebNotebooks/Jupyter-RDFify",
     packages=setuptools.find_packages(),
     install_requires=[
-        "rdflib",
-        "rdflib-jsonld",
+        "rdflib>=6.0.1",
         "ipython>=7.0.0",
         "graphviz",
-        "sparqlwrapper",
-        "owlrl",
-        "PyShEx"
+        "sparqlwrapper>=1.8.5",
+        "sparqlslurper>=0.4",
+        "owlrl"
     ],
     classifiers=[
         "Programming Language :: Python :: 3",