remove obsolete keyword

Author: stlankes

Cargo.toml

@@ -9,7 +9,7 @@ repository = "https://www.github.com/RWTH-OS/xhypervisor"
 documentation = "https://docs.rs/xhypervisor/"
 readme = "README.md"
 description = " Hardware-accelerated virtualization on OS X"
-keywords = ["hypervisor", "virtualization", "osx", "x86", "VT-x", "aarch64"]
+keywords = ["hypervisor", "virtualization", "osx", "x86", "aarch64"]
 
 build = "build.rs"