Update documentation, changelog and other files [skip ci]

Author: juanpedromoreno

AUTHORS.md

@@ -9,6 +9,7 @@
 The maintainers of the project are:
 
 - [![47erbot](https://avatars1.githubusercontent.com/u/24799081?v=4&s=20) **47erbot**](https://github.com/47erbot)
+- [![alejandrohdezma](https://avatars0.githubusercontent.com/u/9027541?v=4&s=20) **Alejandro Hernández (alejandrohdezma)**](https://github.com/alejandrohdezma)
 - [![angoglez](https://avatars0.githubusercontent.com/u/10107285?v=4&s=20) **Ana Gómez González (angoglez)**](https://github.com/angoglez)
 - [![anamariamv](https://avatars0.githubusercontent.com/u/2183589?v=4&s=20) **Ana Mª Marquez (anamariamv)**](https://github.com/anamariamv)
 - [![kiroco12](https://avatars1.githubusercontent.com/u/48894338?v=4&s=20) **Enrique Nieto (kiroco12)**](https://github.com/kiroco12)
@@ -24,4 +25,5 @@ These are the people that have contributed to the _exercises-template_ project:
 - [![jdesiloniz](https://avatars2.githubusercontent.com/u/2835739?v=4&s=20) **jdesiloniz**](https://github.com/jdesiloniz)
 - [![kiroco12](https://avatars1.githubusercontent.com/u/48894338?v=4&s=20) **kiroco12**](https://github.com/kiroco12)
 - [![anamariamv](https://avatars0.githubusercontent.com/u/2183589?v=4&s=20) **anamariamv**](https://github.com/anamariamv)
-- [![angoglez](https://avatars0.githubusercontent.com/u/10107285?v=4&s=20) **angoglez**](https://github.com/angoglez)
+- [![angoglez](https://avatars0.githubusercontent.com/u/10107285?v=4&s=20) **angoglez**](https://github.com/angoglez)
+- [![alejandrohdezma](https://avatars0.githubusercontent.com/u/9027541?v=4&s=20) **alejandrohdezma**](https://github.com/alejandrohdezma)

CHANGELOG.md

@@ -1,5 +1,19 @@
 # Changelog
 
+## [v6.3.4](https://github.com/scala-exercises/exercises-template/tree/v6.3.4) (2020-08-10)
+
+[Full Changelog](https://github.com/scala-exercises/exercises-template/compare/v6.3.3.9...v6.3.4)
+
+📈 **Dependency updates**
+
+- Update sbt-mdoc to 2.2.4 [\#57](https://github.com/scala-exercises/exercises-template/pull/57) ([47erbot](https://github.com/47erbot))
+- Update scalacheck-1-14 to 3.2.1.0 [\#56](https://github.com/scala-exercises/exercises-template/pull/56) ([47erbot](https://github.com/47erbot))
+- Update scalatest to 3.2.1 [\#55](https://github.com/scala-exercises/exercises-template/pull/55) ([47erbot](https://github.com/47erbot))
+- Update sbt-scalafmt to 2.4.2 [\#54](https://github.com/scala-exercises/exercises-template/pull/54) ([47erbot](https://github.com/47erbot))
+- Update scalafmt-core to 2.6.4 [\#53](https://github.com/scala-exercises/exercises-template/pull/53) ([47erbot](https://github.com/47erbot))
+- Update scalafmt-core to 2.6.3 [\#52](https://github.com/scala-exercises/exercises-template/pull/52) ([scala-steward](https://github.com/scala-steward))
+- Update scalafmt-core to 2.6.2 [\#51](https://github.com/scala-exercises/exercises-template/pull/51) ([scala-steward](https://github.com/scala-steward))
+
 ## [v6.3.3.9](https://github.com/scala-exercises/exercises-template/tree/v6.3.3.9) (2020-06-30)
 
 [Full Changelog](https://github.com/scala-exercises/exercises-template/compare/v6.3.3.8...v6.3.3.9)

CODE_OF_CONDUCT.md

@@ -11,7 +11,7 @@ appearance, body size, race, ethnicity, age, religion, nationality, or
 other such characteristics.
 
 Everyone is expected to follow the
-[Scala Code of Conduct](https://typelevel.org/code-of-conduct.html) when
+[Scala Code of Conduct](https://www.scala-lang.org/conduct/) when
 discussing the project on the available communication channels. If you
 are being harassed, please contact us immediately so that we can
 support you.