update readme

Author: maxkahan

V3_TO_V4_SDK_MIGRATION_GUIDE.md

@@ -190,6 +190,8 @@ Methods have been added to help you moderate a voice call:
 - `voice.earmuff`
 - `voice.unearmuff`
 
+Also, the `voice.get_recording` method from v3 has been replaced by `voice.download_recording` in v4. The behaviour also changes as now the method will download the recording for you by streaming the response into a file.
+
 See the [Voice API samples](voice/README.md) for more information.
 
 ### Network Number Verification API

video/README.md

@@ -283,7 +283,7 @@ sip_request_params = InitiateSipRequest(
         uri=f'sip:{vonage_number}@sip.nexmo.com;transport=tls',
         from_=f'test@vonage.com',
         headers={'header_key': 'header_value'},
-        auth=SipAuth(username='1485b9e6', password='fL8jvi4W2FmS9som'),
+        auth=SipAuth(username='your_username', password='your_password'),
         secure=False,
         video=False,
         observe_force_mute=True,