update javadoc plugin config

Crim · Crim · commit 696fd95f212f · 2020-09-26T07:29:41.000+09:00
diff --git a/pom.xml b/pom.xml
@@ -201,6 +201,8 @@
                                 </goals>
                                 <configuration>
                                     <failOnWarnings>false</failOnWarnings>
+                                    <show>public</show>
+                                    <source>8</source>
                                 </configuration>
                             </execution>
                         </executions>
