Working pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>main.incrementing.pw</groupId>
    <artifactId>API</artifactId>
    <version>2.1-ALPHA</version>
    <packaging>jar</packaging>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <repositories>
        <repository>
            <id>spigot-repo</id>
            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
        </repository>
    </repositories>

    <dependencies>
        <!--Spigot API-->
        <dependency>
            <groupId>org.spigotmc</groupId>
            <artifactId>spigot-api</artifactId>
            <version>1.8.8-R0.1-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
        <!--Spigot Server Wrapper-->
        <dependency>
            <groupId>org.bukkit.</groupId>
            <artifactId>bukkit</artifactId>
            <scope>system</scope>
            <version>1.8.8-R0.1-SNAPSHOT</version>
            <systemPath>${basedir}\src\lib\spigot-1.8.8-R0.1-SNAPSHOT.jar</systemPath>
        </dependency>
        <!--Bukkit API-->
        <dependency>
            <groupId>org.bukkit</groupId>
            <artifactId>bukkit</artifactId>
            <version>1.8.8-R0.1-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
        <!-- HikariCP -->
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>2.4.3</version>
        </dependency>
    </dependencies>

    <build>
        <defaultGoal>clean package</defaultGoal>
        <finalName>${project.name}-${project.version}</finalName>
        <sourceDirectory>${basedir}/src/main/java</sourceDirectory>
        <resources>
            <resource>
                <filtering>true</filtering>
                <targetPath>.</targetPath>
                <directory>${basedir}/src/main/resources/</directory>
                <includes>
                    <include>**/*.yml</include>
                </includes>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.3</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <minimizeJar>true</minimizeJar>
                            <createDependencyReducedPom>false</createDependencyReducedPom>
                            <artifactSet>
                                <includes>
                                    <include>com.zaxxer:*</include>
                                    <include>org.slf4j:*</include>
                                </includes>
                            </artifactSet>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>