Removed @beta from HashingInputStream class

Author: sebastienrospars

guava/src/com/google/common/hash/HashingInputStream.java

@@ -16,7 +16,6 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
-import com.google.common.annotations.Beta;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import java.io.FilterInputStream;
 import java.io.IOException;
@@ -28,7 +27,6 @@
  * @author Qian Huang
  * @since 16.0
  */
-@Beta
 @ElementTypesAreNonnullByDefault
 public final class HashingInputStream extends FilterInputStream {
   private final Hasher hasher;