feat(gmailpostmastertools): update the API

#### gmailpostmastertools:v1beta1
The following keys were added:
- schemas.IpReputation.properties.ipCount.description
- schemas.IpReputation.properties.ipCount.format
- schemas.IpReputation.properties.ipCount.type

The following keys were changed:
- schemas.IpReputation.properties.numIps.description

discovery/gmailpostmastertools-v1beta1.json

@@ -265,7 +265,7 @@
       }
     }
   },
-  "revision": "20201016",
+  "revision": "20201124",
   "rootUrl": "https://gmailpostmastertools.googleapis.com/",
   "schemas": {
     "DeliveryError": {
@@ -376,11 +376,16 @@
       "description": "IP Reputation information for a set of IPs in a specific reputation category.",
       "id": "IpReputation",
       "properties": {
-        "numIps": {
+        "ipCount": {
           "description": "Total number of unique IPs in this reputation category. This metric only pertains to traffic that passed [SPF](http://www.openspf.org/) or [DKIM](http://www.dkim.org/).",
           "format": "int64",
           "type": "string"
         },
+        "numIps": {
+          "description": "Total number of unique IPs in this reputation category. This metric only pertains to traffic that passed [SPF](http://www.openspf.org/) or [DKIM](http://www.dkim.org/). Deprecated to be complied with ApiLinter for Quantities. Use ip_count instead.",
+          "format": "int64",
+          "type": "string"
+        },
         "reputation": {
           "description": "The reputation category this IP reputation represents.",
           "enum": [

src/apis/gmailpostmastertools/v1beta1.ts

@@ -177,6 +177,10 @@ export namespace gmailpostmastertools_v1beta1 {
     /**
      * Total number of unique IPs in this reputation category. This metric only pertains to traffic that passed [SPF](http://www.openspf.org/) or [DKIM](http://www.dkim.org/).
      */
+    ipCount?: string | null;
+    /**
+     * Total number of unique IPs in this reputation category. This metric only pertains to traffic that passed [SPF](http://www.openspf.org/) or [DKIM](http://www.dkim.org/). Deprecated to be complied with ApiLinter for Quantities. Use ip_count instead.
+     */
     numIps?: string | null;
     /**
      * The reputation category this IP reputation represents.