Update documentation, changelog and other files [skip ci]

Author: juanpedromoreno

CHANGELOG.md

@@ -1,5 +1,20 @@
 # Changelog
 
+## [v0.6.8](https://github.com/scala-exercises/exercises-cats/tree/v0.6.8) (2020-08-31)
+
+[Full Changelog](https://github.com/scala-exercises/exercises-cats/compare/v0.6.7...v0.6.8)
+
+📈 **Dependency updates**
+
+- Update definitions, exercise-compiler, ... to 0.6.6 [\#143](https://github.com/scala-exercises/exercises-cats/pull/143) ([47erbot](https://github.com/47erbot))
+- Update scalacheck-1-14 to 3.2.2.0 [\#142](https://github.com/scala-exercises/exercises-cats/pull/142) ([47erbot](https://github.com/47erbot))
+- Update scalatest to 3.2.2 [\#141](https://github.com/scala-exercises/exercises-cats/pull/141) ([47erbot](https://github.com/47erbot))
+- Update sbt-mdoc to 2.2.5 [\#140](https://github.com/scala-exercises/exercises-cats/pull/140) ([47erbot](https://github.com/47erbot))
+
+**Closed issues:**
+
+- Eval site is still broken [\#134](https://github.com/scala-exercises/exercises-cats/issues/134)
+
 ## [v0.6.7](https://github.com/scala-exercises/exercises-cats/tree/v0.6.7) (2020-08-10)
 
 [Full Changelog](https://github.com/scala-exercises/exercises-cats/compare/v0.6.6...v0.6.7)
@@ -111,7 +126,6 @@
 - Updating libraries versions [\#57](https://github.com/scala-exercises/exercises-cats/pull/57) ([dominv](https://github.com/dominv))
 - Fixes missing cats Dependency [\#56](https://github.com/scala-exercises/exercises-cats/pull/56) ([juanpedromoreno](https://github.com/juanpedromoreno))
 - Update cats to 0.9.0 and change Xor to Either [\#55](https://github.com/scala-exercises/exercises-cats/pull/55) ([aeons](https://github.com/aeons))
-- Update .travis.yml [\#50](https://github.com/scala-exercises/exercises-cats/pull/50) ([juanpedromoreno](https://github.com/juanpedromoreno))
 
 ## [v0.4.0](https://github.com/scala-exercises/exercises-cats/tree/v0.4.0) (2017-03-28)
 
@@ -129,6 +143,7 @@
 **Merged pull requests:**
 
 - Integrates sbt-org-policies plugin [\#52](https://github.com/scala-exercises/exercises-cats/pull/52) ([juanpedromoreno](https://github.com/juanpedromoreno))
+- Update .travis.yml [\#50](https://github.com/scala-exercises/exercises-cats/pull/50) ([juanpedromoreno](https://github.com/juanpedromoreno))
 - Update Foldable.scala [\#49](https://github.com/scala-exercises/exercises-cats/pull/49) ([lloydmeta](https://github.com/lloydmeta))
 - Updates PGP keys [\#47](https://github.com/scala-exercises/exercises-cats/pull/47) ([juanpedromoreno](https://github.com/juanpedromoreno))
 - SE-597 - Upgrade Libs [\#45](https://github.com/scala-exercises/exercises-cats/pull/45) ([juanpedromoreno](https://github.com/juanpedromoreno))