fix: there is a free tier for logging (#513)

Author: Benjamin E. Coe

.repo-metadata.json

@@ -8,6 +8,5 @@
   "language": "nodejs",
   "repo": "googleapis/nodejs-logging",
   "distribution_name": "@google-cloud/logging",
-  "api_id": "logging.googleapis.com",
-  "requires_billing": true
-}
+  "api_id": "logging.googleapis.com"
+}

README.md

@@ -41,7 +41,6 @@ Google APIs Client Libraries, in [Client Libraries Explained][explained].
 ### Before you begin
 
 1.  [Select or create a Cloud Platform project][projects].
-1.  [Enable billing for your project][billing].
 1.  [Enable the Stackdriver Logging API][enable_api].
 1.  [Set up authentication with a service account][auth] so you can access the
     API from your local workstation.

synth.metadata

@@ -1,5 +1,5 @@
 {
-  "updateTime": "2019-06-12T11:18:58.409664Z",
+  "updateTime": "2019-06-12T23:14:54.301871Z",
   "sources": [
     {
       "generator": {
@@ -12,8 +12,8 @@
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "f117dac435e96ebe58d85280a3faf2350c4d4219",
-        "internalRef": "252714985"
+        "sha": "46bfd341116c385fd1671675f918da7d513b20c4",
+        "internalRef": "252913906"
       }
     },
     {