feat: promote to GA (#31)

Release-As: 1.0.0

.repo-metadata.json

@@ -4,7 +4,7 @@
   "product_documentation": "n/a",
   "api_description": "helps customers migrating VMs to GCP at no additional cost, as well as an extensive ecosystem of partners to help with discovery and assessment, planning, migration, special use cases, and more.",
   "client_documentation": "https://googleapis.dev/java/google-cloud-vmmigration/latest/index.html",
-  "release_level": "preview",
+  "release_level": "stable",
   "transport": "grpc",
   "language": "java",
   "repo": "googleapis/java-vmmigration",

README.md

@@ -8,9 +8,6 @@ Java idiomatic client for [VM Migration][product-docs].
 - [Product Documentation][product-docs]
 - [Client Library Documentation][javadocs]
 
-> Note: This client is a work-in-progress, and may occasionally
-> make backwards-incompatible changes.
-
 
 ## Quickstart
 
@@ -133,9 +130,6 @@ and on [google-cloud-java][g-c-j].
 This library follows [Semantic Versioning](http://semver.org/).
 
 
-It is currently in major version zero (``0.y.z``), which means that anything may change at any time
-and the public API should not be considered stable.
-
 
 ## Contributing
 
@@ -176,7 +170,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-4]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-vmmigration/java8-win.html
 [kokoro-badge-image-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-vmmigration/java11.svg
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-vmmigration/java11.html
-[stability-image]: https://img.shields.io/badge/stability-preview-yellow
+[stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-vmmigration.svg
 [maven-version-link]: https://search.maven.org/search?q=g:com.google.cloud%20AND%20a:google-cloud-vmmigration&core=gav
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication