speech, vision, language: declare Go GA (#456)

diff --git a/google/cloud/language/v1/language_gapic.yaml b/google/cloud/language/v1/language_gapic.yaml
index d520e99..21f138c 100644
--- a/google/cloud/language/v1/language_gapic.yaml
+++ b/google/cloud/language/v1/language_gapic.yaml
@@ -6,6 +6,7 @@
     package_name: google.cloud.language_v1.gapic
   go:
     package_name: cloud.google.com/go/language/apiv1
+    release_level: GA
   csharp:
     package_name: Google.Cloud.Language.V1
   ruby:
diff --git a/google/cloud/speech/v1/cloud_speech_gapic.yaml b/google/cloud/speech/v1/cloud_speech_gapic.yaml
index e78a269..cf9b0dc 100644
--- a/google/cloud/speech/v1/cloud_speech_gapic.yaml
+++ b/google/cloud/speech/v1/cloud_speech_gapic.yaml
@@ -6,6 +6,7 @@
     package_name: google.cloud.speech_v1.gapic
   go:
     package_name: cloud.google.com/go/speech/apiv1
+    release_level: GA
   csharp:
     package_name: Google.Cloud.Speech.V1
   ruby:
diff --git a/google/cloud/vision/v1/vision_gapic.yaml b/google/cloud/vision/v1/vision_gapic.yaml
index 02590e1..f6edb42 100644
--- a/google/cloud/vision/v1/vision_gapic.yaml
+++ b/google/cloud/vision/v1/vision_gapic.yaml
@@ -6,7 +6,7 @@
     package_name: google.cloud.vision_v1.gapic
   go:
     package_name: cloud.google.com/go/vision/apiv1
-    domain_layer_location: cloud.google.com/go/vision
+    release_level: GA
   csharp:
     package_name: Google.Cloud.Vision.V1
   ruby: