Make bot version consistent with Maven

A new internal properties file has been added. Maven will scan this file and replace any value it finds.

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>wtf.beatrice.hidekobot</groupId>
     <artifactId>HidekoBot</artifactId>
-    <version>1.0-SNAPSHOT</version>
+    <version>0.4.0</version>
 
     <properties>
         <maven.compiler.source>16</maven.compiler.source>
@@ -42,7 +42,15 @@
         </dependency>
     </dependencies>
 
+
     <build>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>