add @field:NotNull annotation

Author: HighKo

kotlin-insight-client/kotlin-insight-client-api/pom.xml

@@ -26,6 +26,7 @@
             <groupId>javax.validation</groupId>
             <artifactId>validation-api</artifactId>
             <version>2.0.1.Final</version>
+            <scope>provided</scope>
         </dependency>
     </dependencies>
 </project>