SWIFT-232: update module exported name to bson

Author: mbroadst

Package.swift

@@ -1,13 +1,13 @@
 // swift-tools-version:4.0
 import PackageDescription
 let package = Package(
-    name: "libbson",
+    name: "bson",
     pkgConfig: "libbson-1.0",
     providers: [
         .brew(["mongo-c-driver"]),
         .apt(["libbson-dev"])
     ],
     products: [
-        .library(name: "libbson", targets: ["libbson"])
+        .library(name: "bson", targets: ["bson"])
     ]
 )

module.modulemap

@@ -1,4 +1,4 @@
-module libbson [system] {
+module bson [system] {
     header "libbson.h"
     link "bson-1.0"
     export *