Copyright Update

* Replaced contributors section in README with CONTRIBUTORS.md
* Updated copyright notice to include all contributors
* Updated SMDH

CONTRIBUTORS.md

@@ -0,0 +1,18 @@
+# Main Contributors
+* Alex Taber ([@astronautlevel2](https://github.com/astronautlevel2))
+* [@LiquidFenrir](https://github.com/LiquidFenrir)
+* Dawid Eckert ([@daedreth](https://github.com/daedreth))
+* Dylan G. ([@helloman892](https://github.com/helloman892))
+* Nils P. ([@ZetaDesigns](https://github.com/ZetaDesigns))
+* Matt Kenny ([@mattkenster](https://github.com/mattkenster))
+
+# Minor Contributors
+* Nic ([@Wizzrobes](https://github.com/Wizzrobes))
+* [@saibotu](https://github.com/saibotu)
+* Jeremy Postelnek ([@TurtleP](https://github.com/TurtleP))
+* [@FrozenChen](https://github.com/FrozenChen)
+* Luís Marques ([@luigoalma](https://github.com/luigoalma))
+* [@uyuiyu](https://github.com/uyuiyu)
+* Guillaume Gérard ([@GreatWizard](https://github.com/GreatWizard))
+* Joel ([@joel16](https://github.com/joel16))
+* [@thedax](https://github.com/thedax)