Update google-http-client version and maven surefire plugin (#221)

pom.xml

@@ -15,7 +15,7 @@
   <name>Google Auth Library for Java</name>
   <description>Client libraries providing authentication and
     authorization to enable calling Google APIs.</description>
-  <url>https://github.com/google/google-auth-library-java</url>
+  <url>https://github.com/googleapis/google-auth-library-java</url>
 
   <licenses>
     <license>
@@ -44,10 +44,9 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <java.version>1.6</java.version>
-    <project.google.http.version>1.27.0</project.google.http.version>
+    <project.google.http.version>1.28.0</project.google.http.version>
     <project.junit.version>4.12</project.junit.version>
-    <project.guava.version>20.0</project.guava.version>
+    <project.guava.version>26.0-android</project.guava.version>
     <project.appengine.version>1.9.64</project.appengine.version>
   </properties>
 
@@ -159,7 +158,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-surefire-plugin</artifactId>
-          <version>2.22.0</version>
+          <version>3.0.0-M3</version>
           <configuration>
             <reportNameSuffix>sponge_log</reportNameSuffix>
           </configuration>