[aur-general] Remove maven-3.1.0 package

[Leonidas Spyropoulos]

Please remove the maven-3.1.0 package [1] as the official maven
package [2] is now updated to 3.1.0 version.

[1]: https://aur.archlinux.org/packages/maven-3.1.0/
[2]: https://www.archlinux.org/packages/community/any/maven/

Thanks

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