fixed metadata

pyproject.toml

@@ -8,7 +8,7 @@ version = "0.3.4"
 description = "Simulate nonlinear pulse propagation in optical fibers"
 readme = "README.md"
 authors = [{ name = "Benoit Sierro", email = "benoit.sierro@iap.unibe.ch" }]
-license = { file = "LICENSE" }
+license = {text = "MIT"}
 classifiers = [
     "License :: OSI Approved :: MIT",
     "Programming Language :: Python :: 3",
@@ -16,9 +16,9 @@ classifiers = [
 requires-python = ">=3.10"
 keywords = ["nonlinear", "fiber optics", "simulation", "runge-kutta"]
 dependencies = [
-    "numpy >= 1.23",
-    "scipy >= 1.9.0",
-    "matplotlib >= 3.5.0",
+    "numpy",
+    "scipy",
+    "matplotlib",
     "tomli",
     "tomli_w",
     "numba",