limit number of keywords for cargo publish

Cargo.toml

@@ -3,8 +3,8 @@ authors = ["Tom Krüger"]
 description = "Perplex (hyperbolic or split-complex) numbers based on num-traits"
 documentation = "https://docs.rs/perplex_num"
 homepage = "https://github.com/tomtuamnuq/perplex_num"
-keywords = ["perplex-numbers", "hyperbolic-geometry", "algebra", "split-complex", "minkowski", "mathematics", "numerics", "scientific-computing"]
-categories = ["algorithms", "science::mathematics", "simulation"]
+keywords = ["perplex-numbers", "hyperbolic-geometry", "algebra", "split-complex", "minkowski"]
+categories = ["algorithms", "mathematics", "simulation"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/tomtuamnuq/perplex_num"
 name = "perplex_num"