Add Calvin to authors

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "multiboot2"
 version = "0.2.0"
-authors = ["Philipp Oppermann <dev@phil-opp.com>"]
+authors = ["Philipp Oppermann <dev@phil-opp.com>", "Calvin Lee <cyrus296@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "An experimental Multiboot 2 crate for ELF-64 kernels."