Update Cargo.toml metadata

* Use the description from the README, it's a better description.
* Add the "development-tools::ffi" category.
* Add myself as an author ;)

Author: fitzgen

Cargo.toml

@@ -2,11 +2,12 @@
 authors = [
   "Jyun-Yan You <[email protected]>",
   "Emilio Cobos Álvarez <[email protected]>",
+  "Nick Fitzgerald <[email protected]>",
   "The Servo project developers",
 ]
-description = "A binding generator for Rust"
+description = "Automatically generates Rust FFI bindings to C and C++ libraries."
 keywords = ["bindings", "ffi", "code-generation"]
-categories = ["external-ffi-bindings"]
+categories = ["external-ffi-bindings", "development-tools::ffi"]
 license = "BSD-3-Clause"
 name = "bindgen"
 readme = "README.md"