Fix syntax

pyproject.toml

@@ -9,18 +9,18 @@ homepage = "https://mbees.med.uni-augsburg.de/"
 repository = "https://mbees.med.uni-augsburg.de/gitlab/mbees/boxmox_pypackage"
 keywords = [ "atmosphere", "chemistry", "box model", "boxmox" ]
 classifiers = [
-    "Programming Language :: Python :: 3"
-    "Development Status :: 5 - Production/Stable"
-    "Environment :: Console"
-    "Intended Audience :: Developers"
-    "Intended Audience :: Education"
-    "Intended Audience :: End Users/Desktop"
-    "Intended Audience :: Science/Research"
-    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)"
-    "Operating System :: POSIX"
-    "Topic :: Education"
-    "Topic :: Scientific/Engineering"
-    "Topic :: Utilities"
+    "Programming Language :: Python :: 3",
+    "Development Status :: 5 - Production/Stable",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Education",
+    "Intended Audience :: End Users/Desktop",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
+    "Operating System :: POSIX",
+    "Topic :: Education",
+    "Topic :: Scientific/Engineering",
+    "Topic :: Utilities",
 ]
 packages = [
     { include = "boxmox", from = "src" },