feat: change license from MIT to MIT + Apache 2.0

[vmx]

In order to unify the licenses across several multiformats repositories
I propose changing the license to an MIT + Apache 2.0 dual license.

In order to make this change, it needs to be approved by all contributors.

If you agree with such a license change, please respond to this PR with:

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[vmx]

I hereby ping all the current contributors (@dignifiedquire @maciejhirsz, @tomusdrw, @tomaka, @leavehouse, @hobofan, @dvc94ch, @gnunicorn, @rklaehn @bantonsson @Gozala) to please agree to the license change with replying to this PR with:

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[dvc94ch]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

Still not sure what the point is, other than license supremacy and exterminating the lesser licensing options.

[Gozala]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[dignifiedquire]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[hobofan]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[bantonsson]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[gnunicorn]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[tomusdrw]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[tomaka]

Same

[maciejhirsz]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[vmx]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[vmx]

@koushiro as you contributed quite a lot recently, could you also please comment that you re-license your contributions?

[koushiro]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[rklaehn]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[Gozala]

I license past and future contributions under the dual MIT/Apache-2.0 license, allowing licensees to choose either at their option.

[Leena8686]

approval for change MIT to MIT M+ Apache 2.0