Bump guava to 28.2-android

Author: Capstan

Diff for: project.gradle

@@ -43,7 +43,7 @@ dependencies {
     testCompile(group: "org.mockito", name: "mockito-core", version: "2.28.2");
     // FIXME: update to 3.x once we're off of Java 7
     testCompile(group: "org.assertj", name: "assertj-core", version: "2.9.1");
-    testCompile(group: "com.google.guava", name: "guava", version: "28.1-android");
+    testCompile(group: "com.google.guava", name: "guava", version: "28.2-android");
 }
 
 javadoc.options {
@@ -57,7 +57,7 @@ javadoc.options {
     links("https://fasterxml.github.com/jackson-databind/javadoc/2.11/");
     links("https://fasterxml.github.com/jackson-core/javadoc/2.11/");
     links("https://fasterxml.github.com/jackson-annotations/javadoc/2.11/");
-    links("https://www.javadoc.io/doc/com.google.guava/guava/28.1-android/");
+    links("https://www.javadoc.io/doc/com.google.guava/guava/28.2-android/");
     links("https://java-json-tools.github.io/msg-simple/");
     links("https://java-json-tools.github.io/jackson-coreutils/");
 }