unity3d: 2017.4.10f1 -> 2018.3.0f2

[tesq0]

Motivation for this change

Allow people to use a newer version of unity on nixos

Things done

• [x ] Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • [ x] NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• [x ] Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• [ x] Assured whether relevant documentation is up to date
• [ x] Fits CONTRIBUTING.md.

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[ryantm]

@GrahamcOfBorg build unity3d

[timokau]

Welcome to the team! Please reorder your commits (currently the first commit fails to evaluate since you added yourself to the maintainer list of the package before declaring yourself as a maintainer). Also split the update commit into two, one adding yourself to the maintainer list and one updating the package. The resulting commits should be:

1. maintainers: add tesq0
2. unity3d: add tesq0 to the maintainers
3. unity3d: 2017.4.10f1 -> 2018.3.0f2

[tesq0]

@timokau Should be good now

[timokau]

Thanks again!