v1.0.9: Made DServices4J available on jcenter

DServices4J is now available on Jcenter meaning it's easier to add to your pom.xml or build.gradle.

Other changes:

• Command was renamed to Commands to match the other classes.
• Requests won't throw a NullPointer anymore when the API returns an empty body (which it does on successfull calls)

<repositories>
  <repository>
    <id>Bintray</id>
    <url>https://jcenter.bintray.com</url>
  </repository>
</repositories>

<dependencies>
  <dependency>
    <groupId>net.discordservices</groupId>
    <artifactId>DServices4J</artifactId>
    <version>1.0.9</version>
  </dependency>
</dependencies>

repositories{
  jcenter()
}

dependencies{
  implementation 'net.discordservices:DServices4J:1.0.9'
}