Add license

Author: AdamNogell

pyproject.toml

@@ -19,9 +19,9 @@ maintainers = [
 description = "Computing and drawing ExP heatmap for displaying complex cross-population data"
 readme = "README.md"
 requires-python = ">=3.8"
+license = "MIT"
 classifiers = [
     "Programming Language :: Python :: 3",
-    "License :: MIT-Based Custom License",
     "Operating System :: OS Independent",
     "Topic :: Scientific/Engineering :: Bio-Informatics"
 ]