Upgrade Error Prone 2.9.0 -> 2.10.0 (#175)

See:
- https://github.com/google/error-prone/releases/tag/v2.10.0
- google/error-prone@v2.9.0...v2.10.0

pom.xml

@@ -96,7 +96,7 @@
         <error-prone.args />
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <version.auto-service>1.0.1</version.auto-service>
-        <version.error-prone>2.9.0</version.error-prone>
+        <version.error-prone>2.10.0</version.error-prone>
         <version.error-prone-javac>9+181-r4173-1</version.error-prone-javac>
         <version.guava-beta-checker>1.0</version.guava-beta-checker>
         <version.immutables>2.8.8</version.immutables>
@@ -1015,10 +1015,15 @@
                                     --> -Xep:AndroidJdkLibsChecker:OFF <!--
                                     We don't target JDK 7.
                                     --> -Xep:Java7ApiChecker:OFF <!--
+                                    We don't target JDK 8.
+                                    --> -Xep:Java8ApiChecker:OFF <!--
                                     Deals with an Android-specific limitation
                                     not applicable to us. See also
                                     https://github.com/google/error-prone/issues/488.
                                     --> -Xep:StaticOrDefaultInterfaceMethod:OFF <!--
+                                    XXX: This check flags false positives.
+                                    See https://github.com/google/error-prone/issues/2679.
+                                    --> -Xep:VoidMissingNullable:OFF <!--
                                     --> -XepOpt:NullAway:AnnotatedPackages=tech.picnic <!--
                                     --> -XepOpt:NullAway:AssertsEnabled=true <!--
                                     Append additional custom arguments.