Vision moved to beta stage (#1701)

Vision moved to beta stage
Fix MessageReceiver doc

Author: vam-google

google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/spi/v1/MessageReceiver.java

@@ -24,7 +24,7 @@ public interface MessageReceiver {
    * Called when a message is received by the subscriber. The implementation must arrange for {@link
    * AckReplyConsumer#accept} to be called after processing the {@code message}.
    *
-   * <p>This {@code MessageReceiver} passes all messages to a {@link BlockingQueue}.
+   * <p>This {@code MessageReceiver} passes all messages to a {@code BlockingQueue}.
    * This method can be called concurrently from multiple threads,
    * so it is important that the queue be thread-safe.
    * 

google-cloud-vision/pom.xml

@@ -2,6 +2,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <artifactId>google-cloud-vision</artifactId>
+  <version>${beta.version}</version>
   <packaging>jar</packaging>
   <name>Google Cloud Vision</name>
   <url>https://github.com/GoogleCloudPlatform/google-cloud-java/tree/master/google-cloud-vision</url>

google-cloud/pom.xml

@@ -92,7 +92,7 @@
     <dependency>
       <groupId>${project.groupId}</groupId>
       <artifactId>google-cloud-vision</artifactId>
-      <version>${project.version}</version>
+      <version>${beta.version}</version>
     </dependency>
   </dependencies>
 </project>