fix(docs): downgrade to beta to match release level (#19)

Matching what's in googleapis, data in DRIFT is wrong

.repo-metadata.json

@@ -4,7 +4,7 @@
   "product_documentation": "https://cloud.google.com/binary-authorization/",
   "client_documentation": "https://googleapis.dev/nodejs/binaryauthorization/latest/",
   "issue_tracker": "https://github.com/googleapis/nodejs-binary-authorization/issues",
-  "release_level": "GA",
+  "release_level": "beta",
   "language": "nodejs",
   "repo": "googleapis/nodejs-binary-authorization",
   "distribution_name": "@google-cloud/binary-authorization",

README.md

@@ -4,7 +4,7 @@
 
 # [Binary Authorization: Node.js Client](https://github.com/googleapis/nodejs-binary-authorization)
 
-[![release level](https://img.shields.io/badge/release%20level-general%20availability%20%28GA%29-brightgreen.svg?style=flat)](https://cloud.google.com/terms/launch-stages)
+[![release level](https://img.shields.io/badge/release%20level-beta-yellow.svg?style=flat)](https://cloud.google.com/terms/launch-stages)
 [![npm version](https://img.shields.io/npm/v/@google-cloud/binary-authorization.svg)](https://www.npmjs.org/package/@google-cloud/binary-authorization)
 [![codecov](https://img.shields.io/codecov/c/github/googleapis/nodejs-binary-authorization/master.svg?style=flat)](https://codecov.io/gh/googleapis/nodejs-binary-authorization)
 
@@ -121,6 +121,11 @@ This library follows [Semantic Versioning](http://semver.org/).
 
 
 
+This library is considered to be in **beta**. This means it is expected to be
+mostly stable while we work toward a general availability release; however,
+complete stability is not guaranteed. We will address issues and requests
+against beta libraries with a high priority.
+
 
 
 

synth.metadata

@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "57c23fa5705499a4181095ced81f0ee0933b64f6"
+        "sha": "8c5628b86cfa8386de7b8fc1675e6b528b552d57"
       }
     }
   ],