Update dependencies to be current.

Also, update "license" field to be current syntax.

The old "licenses" structure is deprecated.
Reference: https://docs.npmjs.com/files/package.json

package.json

@@ -1,12 +1,7 @@
 {
   "name": "passport-saml",
   "version": "0.20.1",
-  "licenses": [
-    {
-      "type": "MIT",
-      "url": "https://github.com/bergie/passport-saml/raw/master/LICENSE"
-    }
-  ],
+  "license" : "MIT",
   "keywords": [
     "saml",
     "adfs",
@@ -33,10 +28,10 @@
   "dependencies": {
     "passport-strategy": "*",
     "q": "^1.5.0",
-    "xml-crypto": "^0.9.0",
+    "xml-crypto": "^0.10.1",
     "xml-encryption": "^0.11.0",
     "xml2js": "0.4.x",
-    "xmlbuilder": "^8.2.2",
+    "xmlbuilder": "^9.0.4",
     "xmldom": "0.1.x"
   },
   "devDependencies": {