build: remove flatten maven plugin (#40)

Author: Maglitch65

pom.xml

@@ -59,31 +59,6 @@
 
     <build>
         <plugins>
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>flatten-maven-plugin</artifactId>
-                <version>1.2.7</version>
-                <configuration>
-                    <flattenMode>resolveCiFriendliesOnly</flattenMode>
-                    <updatePomFile>true</updatePomFile>
-                </configuration>
-                <executions>
-                    <execution>
-                        <id>flatten</id>
-                        <phase>process-resources</phase>
-                        <goals>
-                            <goal>flatten</goal>
-                        </goals>
-                    </execution>
-                    <execution>
-                        <id>flatten-clean</id>
-                        <phase>clean</phase>
-                        <goals>
-                            <goal>clean</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>