Use pyVoIP from git (latest fixes) and fix service registration (v2.0.6)

sip-notifier/config.yaml

@@ -1,7 +1,7 @@
 name: "SIP Voice Notifier"
-version: "2.0.5"
+version: "2.0.6"
 slug: "sip-notifier"
-description: "Send voice notifications via SIP phone calls (includes integration)"
+description: "Send voice notifications via SIP phone calls"
 arch:
   - aarch64
   - amd64
@@ -14,8 +14,6 @@ boot: auto
 homeassistant_api: true
 hassio_api: true
 hassio_role: default
-services:
-  - sip_notifier.send_notification:sip_notifier
 ports:
   8099/tcp: null
 options: