Simplify dependency handling in setup.py

Removed the parse_requirements function and directly listed all dependencies within the setup.py file. This change improves setup script readability and eliminates the need to parse an external requirements file.

setup.py

@@ -1,12 +1,5 @@
 from setuptools import setup, find_packages
 
-def parse_requirements(filename):
-    """ load requirements from a pip requirements file """
-    with open(filename, 'r') as f:
-        lines = f.readlines()
-    return [line.strip() for line in lines if
-            line.strip() and not line.startswith('#')]
-
 setup(
     name='ssalib',
     version='0.1.0b1',
@@ -21,7 +14,15 @@ def parse_requirements(filename):
     description='Singular Spectrum Analysis Library (SSALib)',
     long_description=open('README.md').read(),
     long_description_content_type='text/markdown',
-    install_requires=parse_requirements('requirements.txt'),
+    install_requires=[
+        'joblib',
+        'numpy',
+        'matplotlib',
+        'pandas',
+        'scipy',
+        'scikit-learn',
+        'statsmodels'
+    ],
     extras_require={
         'test': [
             'pytest',
@@ -48,4 +49,4 @@ def parse_requirements(filename):
         'Topic :: Scientific/Engineering',
     ],
     keywords='singular spectrum analysis, time series, decomposition',
-)
+)