Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/identitytoolkit_v3.relyingparty.html b/docs/dyn/identitytoolkit_v3.relyingparty.html
index 2d514ab..03e9cbb 100644
--- a/docs/dyn/identitytoolkit_v3.relyingparty.html
+++ b/docs/dyn/identitytoolkit_v3.relyingparty.html
@@ -204,6 +204,7 @@
 
 { # Request to download user account in batch.
     "nextPageToken": "A String", # The token for the next page. This should be taken from the previous response.
+    "targetProjectId": "A String", # Specify which project (field value is actually project id) to operate. Only used when provided credential.
     "delegatedProjectNumber": "A String", # GCP project number of the requesting delegated app. Currently only intended for Firebase V1 migration.
     "maxResults": 42, # The max number of results to return in the response.
   }
@@ -217,6 +218,7 @@
     "kind": "identitytoolkit#DownloadAccountResponse", # The fixed string "identitytoolkit#DownloadAccountResponse".
     "users": [ # The user accounts data.
       { # Template for an individual account info.
+        "rawPassword": "A String", # The user's plain text password.
         "passwordHash": "A String", # The user's hashed password.
         "displayName": "A String", # The name of the user.
         "localId": "A String", # The local ID of the user.
@@ -232,7 +234,6 @@
             "federatedId": "A String", # User's identifier at IDP.
             "displayName": "A String", # The user's display name at the IDP.
             "photoUrl": "A String", # The user's photo url at the IDP.
-            "rawUserInfo": "A String", # Raw IDP-returned user info.
             "providerId": "A String", # The IdP ID. For white listed IdPs it's a short domain name, e.g., google.com, aol.com, live.net and yahoo.com. For other OpenID IdPs it's the OP identifier.
             "rawId": "A String", # User's raw identifier directly returned from IDP.
             "email": "A String", # User's email at IDP.
@@ -276,6 +277,7 @@
     "kind": "identitytoolkit#GetAccountInfoResponse", # The fixed string "identitytoolkit#GetAccountInfoResponse".
     "users": [ # The info of the users.
       { # Template for an individual account info.
+        "rawPassword": "A String", # The user's plain text password.
         "passwordHash": "A String", # The user's hashed password.
         "displayName": "A String", # The name of the user.
         "localId": "A String", # The local ID of the user.
@@ -291,7 +293,6 @@
             "federatedId": "A String", # User's identifier at IDP.
             "displayName": "A String", # The user's display name at the IDP.
             "photoUrl": "A String", # The user's photo url at the IDP.
-            "rawUserInfo": "A String", # Raw IDP-returned user info.
             "providerId": "A String", # The IdP ID. For white listed IdPs it's a short domain name, e.g., google.com, aol.com, live.net and yahoo.com. For other OpenID IdPs it's the OP identifier.
             "rawId": "A String", # User's raw identifier directly returned from IDP.
             "email": "A String", # User's email at IDP.
@@ -350,6 +351,7 @@
   An object of the form:
 
     { # Response of getting the project configuration.
+    "dynamicLinksDomain": "A String",
     "apiKey": "A String", # Browser API key, needed when making http request to Apiary.
     "useEmailSending": True or False, # Whether to use email sending provided by Firebear.
     "projectId": "A String", # Project ID of the relying party.
@@ -631,9 +633,12 @@
 { # Request to signup new user, create anonymous user or anonymous user reauth.
     "instanceId": "A String", # Instance id token of the app.
     "displayName": "A String", # The name of the user.
+    "photoUrl": "A String", # The photo url of the user.
     "captchaResponse": "A String", # Response to the captcha.
-    "idToken": "A String", # The GITKit token of the authenticated user.
+    "emailVerified": True or False, # Mark the email as verified or not. Only can be used by service account.
+    "disabled": True or False, # Whether to disable the user. Only can be used by service account.
     "captchaChallenge": "A String", # The captcha challenge.
+    "idToken": "A String", # The GITKit token of the authenticated user.
     "password": "A String", # The new password of the user.
     "email": "A String", # The email of the user.
   }
@@ -664,8 +669,10 @@
 { # Request to upload user account in batch.
     "hashAlgorithm": "A String", # The password hash algorithm.
     "delegatedProjectNumber": "A String", # GCP project number of the requesting delegated app. Currently only intended for Firebase V1 migration.
+    "allowOverwrite": True or False, # Whether allow overwrite existing account when user local_id exists.
     "users": [ # The account info to be stored.
       { # Template for an individual account info.
+        "rawPassword": "A String", # The user's plain text password.
         "passwordHash": "A String", # The user's hashed password.
         "displayName": "A String", # The name of the user.
         "localId": "A String", # The local ID of the user.
@@ -681,7 +688,6 @@
             "federatedId": "A String", # User's identifier at IDP.
             "displayName": "A String", # The user's display name at the IDP.
             "photoUrl": "A String", # The user's photo url at the IDP.
-            "rawUserInfo": "A String", # Raw IDP-returned user info.
             "providerId": "A String", # The IdP ID. For white listed IdPs it's a short domain name, e.g., google.com, aol.com, live.net and yahoo.com. For other OpenID IdPs it's the OP identifier.
             "rawId": "A String", # User's raw identifier directly returned from IDP.
             "email": "A String", # User's email at IDP.