Prepare for release 28.1.

RELNOTES=n/a

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=265978211

Author: cgdecker

README.md

@@ -21,7 +21,7 @@ Guava's Maven group ID is `com.google.guava` and its artifact ID is `guava`.
 Guava provides two different "flavors": one for use on a (Java 8+) JRE and one
 for use on Android or Java 7 or by any library that wants to be compatible with
 either of those. These flavors are specified in the Maven version field as
-either `28.0-jre` or `28.0-android`. For more about depending on
+either `28.1-jre` or `28.1-android`. For more about depending on
 Guava, see [using Guava in your build].
 
 To add a dependency on Guava using Maven, use the following:
@@ -30,19 +30,19 @@ To add a dependency on Guava using Maven, use the following:
 <dependency>
   <groupId>com.google.guava</groupId>
   <artifactId>guava</artifactId>
-  <version>28.0-jre</version>
+  <version>28.1-jre</version>
   <!-- or, for Android: -->
-  <version>28.0-android</version>
+  <version>28.1-android</version>
 </dependency>
 ```
 
 To add a dependency using Gradle:
 
 ```gradle
 dependencies {
-  compile 'com.google.guava:guava:28.0-jre'
+  compile 'com.google.guava:guava:28.1-jre'
   // or, for Android:
-  api 'com.google.guava:guava:28.0-android'
+  api 'com.google.guava:guava:28.1-android'
 }
 ```
 

android/guava/src/com/google/common/net/HttpHeaders.java

@@ -175,7 +175,7 @@ private ReferrerPolicyValues() {}
    * The HTTP <a href="https://w3c.github.io/webappsec-upgrade-insecure-requests/#preference">{@code
    * Upgrade-Insecure-Requests}</a> header field name.
    *
-   * @since NEXT
+   * @since 28.1
    */
   public static final String UPGRADE_INSECURE_REQUESTS = "Upgrade-Insecure-Requests";
 

android/guava/src/com/google/common/net/MediaType.java

@@ -245,14 +245,14 @@ private static MediaType addKnownType(MediaType mediaType) {
   /**
    * <a href="https://www.iana.org/assignments/media-types/image/heif">HEIF image format</a>.
    *
-   * @since NEXT
+   * @since 28.1
    */
   public static final MediaType HEIF = createConstant(IMAGE_TYPE, "heif");
 
   /**
    * <a href="https://tools.ietf.org/html/rfc3745">JP2K image format</a>.
    *
-   * @since NEXT
+   * @since 28.1
    */
   public static final MediaType JP2K = createConstant(IMAGE_TYPE, "jp2");
 

guava-testlib/src/com/google/common/collect/testing/SpliteratorTester.java

@@ -239,7 +239,7 @@ public static <E> SpliteratorTester<E> of(Supplier<Spliterator<E>> spliteratorSu
         ImmutableSet.of(() -> new GeneralSpliteratorOfObject<>(spliteratorSupplier.get())));
   }
 
-  /** @since NEXT */
+  /** @since 28.1 */
   @SuppressWarnings("AndroidJdkLibsChecker") // see comment on GeneralSpliteratorOfPrimitive
   public static SpliteratorTester<Integer> ofInt(Supplier<Spliterator.OfInt> spliteratorSupplier) {
     return new SpliteratorTester<>(
@@ -248,7 +248,7 @@ public static SpliteratorTester<Integer> ofInt(Supplier<Spliterator.OfInt> split
             () -> new GeneralSpliteratorOfPrimitive<>(spliteratorSupplier.get(), c -> c::accept)));
   }
 
-  /** @since NEXT */
+  /** @since 28.1 */
   @SuppressWarnings("AndroidJdkLibsChecker") // see comment on GeneralSpliteratorOfPrimitive
   public static SpliteratorTester<Long> ofLong(Supplier<Spliterator.OfLong> spliteratorSupplier) {
     return new SpliteratorTester<>(
@@ -257,7 +257,7 @@ public static SpliteratorTester<Long> ofLong(Supplier<Spliterator.OfLong> splite
             () -> new GeneralSpliteratorOfPrimitive<>(spliteratorSupplier.get(), c -> c::accept)));
   }
 
-  /** @since NEXT */
+  /** @since 28.1 */
   @SuppressWarnings("AndroidJdkLibsChecker") // see comment on GeneralSpliteratorOfPrimitive
   public static SpliteratorTester<Double> ofDouble(
       Supplier<Spliterator.OfDouble> spliteratorSupplier) {

guava/src/com/google/common/net/HttpHeaders.java

@@ -175,7 +175,7 @@ private ReferrerPolicyValues() {}
    * The HTTP <a href="https://w3c.github.io/webappsec-upgrade-insecure-requests/#preference">{@code
    * Upgrade-Insecure-Requests}</a> header field name.
    *
-   * @since NEXT
+   * @since 28.1
    */
   public static final String UPGRADE_INSECURE_REQUESTS = "Upgrade-Insecure-Requests";
 

guava/src/com/google/common/net/MediaType.java

@@ -245,14 +245,14 @@ private static MediaType addKnownType(MediaType mediaType) {
   /**
    * <a href="https://www.iana.org/assignments/media-types/image/heif">HEIF image format</a>.
    *
-   * @since NEXT
+   * @since 28.1
    */
   public static final MediaType HEIF = createConstant(IMAGE_TYPE, "heif");
 
   /**
    * <a href="https://tools.ietf.org/html/rfc3745">JP2K image format</a>.
    *
-   * @since NEXT
+   * @since 28.1
    */
   public static final MediaType JP2K = createConstant(IMAGE_TYPE, "jp2");