Update Rust.gitignore

no need to specifically ignore compiled files and executables
as it will be under the target directory

Rust.gitignore

-# Compiled files
-*.o
-*.so
-*.rlib
-*.dll
-
-# Executables
-*.exe
-
 # Generated by Cargo
+# will have compiled files and executables
 /target/
 
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries