Bump to 1.6.3-1, add crates.io category

mongoc-sys/Cargo.toml

@@ -1,15 +1,14 @@
 [package]
 name        = "mongoc-sys"
-version     = "1.6.3"
+version     = "1.6.3-1"
 description = "Sys package with installer and bindings for mongoc"
 authors     = ["Thijs Cadier <thijs@appsignal.com>"]
 build       = "build.rs"
 repository  = "https://github.com/thijsc/mongo-rust-driver"
 links       = "mongoc"
 license     = "MIT/Apache-2.0"
-exclude = [
-    "mongo-c-driver-*"
-]
+categories  = ["external-ffi-bindings"]
+exclude     = ["mongo-c-driver-*"]
 
 [dependencies]
 libc        = "0.2"