Keep the number of keywords <= 5

Cargo.toml

@@ -8,7 +8,7 @@ description = "A fast K Nearest Neighbor (KNN) library for low-dimensional space
 repository = "https://github.com/enlightware/nabo-rs"
 homepage = "https://github.com/enlightware/nabo-rs"
 readme = "README.md"
-keywords = ["NNS", "nearest_neighbor", "K-D_tree", "data_structures", "KNN", "no_std"]
+keywords = ["nearest_neighbor", "K-D_tree", "data_structures", "KNN", "no_std"]
 categories = ["mathematics", "science", "computer-vision", "multimedia", "game-development"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html