fix: make dependencies explicit

Author: ohjunseung

setup.py

@@ -22,13 +22,6 @@ def long_description():
         return fh.read()
 
 
-def requirements():
-    # check if requirements.txt exists
-    if not os.path.exists("requirements.txt"):
-        return []
-    with open("requirements.txt") as f:
-        return f.read().splitlines()
-
 
 extras_require = {
     "docs": [
@@ -61,7 +54,7 @@ def requirements():
     long_description_content_type="text/markdown",
     url="https://github.com/DenverCoder1/table2ascii",
     packages=["table2ascii"],
-    install_requires=requirements(),
+    install_requires=["typing-extensions>=3.7.4; python_version<'3.8'","wcwidth<1"],
     extras_require=extras_require,
     setup_requires=[],
     tests_require=[