Fixed pyproject.toml

Author: jmafoster1

pyproject.toml

@@ -17,7 +17,7 @@ keywords = ["causal inference", "verification"]
 dependencies = [
     "z3_solver~=4.11.2", # z3_solver does not follow semantic versioning and tying to 4.11 introduces problems
     "fitter~=1.7",
-    "lifelines~=0.29.0"
+    "lifelines~=0.29.0",
     "lhsmdu~=1.1",
     "networkx~=2.6",
     "numpy~=1.26",