Update dependency versions

Fixes #326

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=226512283

Author: ronshapiro

pom.xml

@@ -95,9 +95,9 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <java.version>1.8</java.version>
-    <guava.version>22.0</guava.version>
+    <guava.version>27.0.1-jre</guava.version>
     <javac.version>9+181-r4173-1</javac.version>
-    <truth.version>0.36</truth.version>
+    <truth.version>0.40</truth.version>
     <jsr305.version>3.0.2</jsr305.version>
   </properties>