Upgrade error_prone_core to 2.0.19

Change-Id: I1be90aa8e08c487d1795544b5f96f7cb6000af45

pom.xml

diff --git a/pom.xml b/pom.xml
index 85ed106..8ee2fe5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -395,7 +395,7 @@
           <dependency>
             <groupId>com.google.errorprone</groupId>
             <artifactId>error_prone_core</artifactId>
-            <version>2.0.18</version>
+            <version>2.0.19</version>
           </dependency>
         </dependencies>
       </plugin>