Update package infos in Cargo.toml

Cargo.toml

@@ -3,9 +3,9 @@ name = "opossum"
 version = "0.1.0"
 edition = "2021"
 authors = ["Udo Eisenbarth <u.eisenbarth@gsi.de>", "Yannik Zobus <y.zobus@gsi.de>"]
-description = "Open-source optics simulation software and unified modeller"
+description = "Open-source Optics Simulation Software and Unified Modeler"
 repository = "https://git.gsi.de/phelix/rust/opossum/"
-license = "GPL-2.0-or-later"
+license = "GPL-3.0-or-later"
 keywords = ["laser", "optics", "physics", "simulation"]
 categories = [ "science", "simulation"]
 publish = false