Change contributors file encoding to UTF-8.

ISO-8859 is not a good format for storing names, this often causes problems
with non-English characters.

Author: leftaroundabout

CONTRIBUTORS.md

@@ -13,9 +13,9 @@ We are grateful for contributions and would like to acknowledge all people who h
 * [Holger Kohr](https://github.com/kohr-h). Package maintainer. Was part of the design of ODL and created several of the submodules, including `odl.discr`, `odl.trafos` and `odl.tomo`. Has contributed to most modules.
 * [Gregory R. Lee](https://github.com/grlee77). Bugfixes.
 * [Julian Moosmann](https://github.com/moosmann). Significant work on the initial `odl.tomo` module.
-* [Kati Niinimäki](https://github.com/niinimaki). Implemented the `WaveletTransform`.
+* [Kati Niinimäki](https://github.com/niinimaki). Implemented the `WaveletTransform`.
 * [Willem Jan Palenstijn](https://github.com/wjp). Added adjoint of `RayTransform`.
 * [Axel Ringh](https://github.com/aringh). Created much of the `odl.solvers` module, in particular oversaw the addition of `Functional`.
 * [Olivier Verdier](https://github.com/olivierverdier). Typos.
 * [Gustav Zickert](https://github.com/zickert). Started the `odl.contrib.fom` package.
-* [Ozan Öktem](https://github.com/ozanoktem). Father of the project. Proposed the idea and made sure we had money to get it done!
+* [Ozan Öktem](https://github.com/ozanoktem). Father of the project. Proposed the idea and made sure we had money to get it done!