fix release build profile

Crim · Crim · commit f709598002f6 · 2021-01-18T22:58:52.000+09:00
diff --git a/pom.xml b/pom.xml
@@ -265,6 +265,9 @@
                                 <goals>
                                     <goal>jar</goal>
                                 </goals>
+                                <configuration>
+                                    <source>8</source>
+                                </configuration>
                             </execution>
                         </executions>
                     </plugin>
