fix: remove temporary added animal-sniffer-annotations exclusion rule from pom (#16)

| Package | Update | Change |
|---|---|---|
| com.google.guava:guava-bom | minor | `28.1-android` -> `28.2-android` |

The new version of Guava no longer has a dependency on `org.codehaus.mojo:animal-sniffer-annotations`
Fixes #3

Author: athakor

google-cloud-datastore/pom.xml

@@ -34,11 +34,11 @@
       <groupId>io.grpc</groupId>
       <artifactId>grpc-api</artifactId>
       <exclusions>
-        <!-- currently collides with animal-sniffer-annotations from guava -->
-        <!-- TODO(#3) try to remove after the next bump of guava -->
+        <!-- currently collides with error_prone_annotations from grpc -->
+        <!-- TODO: try to remove after the next bump of grpc -->
         <exclusion>
-          <groupId>org.codehaus.mojo</groupId>
-          <artifactId>animal-sniffer-annotations</artifactId>
+          <groupId>com.google.errorprone</groupId>
+          <artifactId>error_prone_annotations</artifactId>
         </exclusion>
       </exclusions>
     </dependency>

pom.xml

@@ -159,7 +159,7 @@
     <grpc.version>1.26.0</grpc.version>
     <protobuf.version>3.11.1</protobuf.version>
     <junit.version>4.13</junit.version>
-    <guava.version>28.1-android</guava.version>
+    <guava.version>28.2-android</guava.version>
     <threeten.version>1.4.0</threeten.version>
     <opencensus.version>0.24.0</opencensus.version>
     <mockito.version>1.10.19</mockito.version>