betas for logging-{winston,bunyan}, error-reporting (googleapis#2454)

These modules can now be declared in beta.

Author: ofrobots

packages/error-reporting/README.md

@@ -3,8 +3,7 @@
 [![NPM Version][npm-image]][npm-url]
 [![Known Vulnerabilities][snyk-image]][snyk-url]
 
-> This module is experimental, and should be used by early adopters.
-> This module uses APIs that may be undocumented and are subject to change without notice.
+> **Beta** *This is a Beta release of the Stackdriver Error Reporting libraries for Node.js. These libraries might be changed in backward-incompatible ways and are not subject to any SLA or deprecation policy.*
 
 This module provides Stackdriver Error Reporting support for Node.js applications.
 [Stackdriver Error Reporting](https://cloud.google.com/error-reporting/) is a feature of

packages/logging-bunyan/README.md

@@ -5,7 +5,7 @@ This module provides an easy to use, higher-level layer for working with Stackdr
 
 For lower-level access to the Stackdriver Logging API, see [@google-cloud/logging][@google-cloud/logging].
 
-> *This module is experimental and should be used by early adopters. This module uses APIs that may be undocumented and subject to change without notice.*
+> **Beta** *This is a Beta release of the Stackdriver Logging libraries for Node.js. These libraries might be changed in backward-incompatible ways and are not subject to any SLA or deprecation policy.*
 
 ``` sh
 $ npm install --save @google-cloud/logging-bunyan

packages/logging-winston/README.md

@@ -5,7 +5,7 @@ This module provides an easy to use, higher-level layer for working with Stackdr
 
 For lower-level access to the Stackdriver Logging API, see [@google-cloud/logging][@google-cloud/logging].
 
-> *This module is experimental and should be used by early adopters. This module uses APIs that may be undocumented and subject to change without notice.*
+> **Beta** *This is a Beta release of the Stackdriver Logging libraries for Node.js. These libraries might be changed in backward-incompatible ways and are not subject to any SLA or deprecation policy.*
 
 ``` sh
 $ npm install --save @google-cloud/logging-winston