Add XML payload support

Fixes #238

test/hooks.yaml.tmpl

@@ -76,6 +76,25 @@
   include-command-output-in-response: true
   command-working-directory: /
 
+- id: xml
+  execute-command: '{{ .Hookecho }}'
+  command-working-directory: /
+  response-message: success
+  trigger-rule:
+    and:
+    - match:
+        type: value
+        parameter:
+          source: payload
+          name: app.users.user.0.-name
+        value: Jeff
+    - match:
+        type: value
+        parameter:
+          source: payload
+          name: "app.messages.message.#text"
+        value: "Hello!!"
+
 - id: capture-command-output-on-success-not-by-default
   pass-arguments-to-command:
   - source: string
@@ -113,4 +132,4 @@
 
 - id: warn-on-space
   execute-command: '{{ .Hookecho }} foo'
-  include-command-output-in-response: true
+  include-command-output-in-response: true