[1.11]: Prep for new release (#567)

* Prep for 1.11

* Remove support for 1.6

* Update copyright year

* set 1.11.2 as final version

* Tests

.github/workflows/tests.yml

@@ -42,7 +42,7 @@ jobs:
     strategy:
       # Allows running the job multiple times with different configurations
       matrix:
-        crystal: [1.6, 1.7, 1.8, 1.9, 1.10.1]
+        crystal: ["1.7", "1.8", "1.9", "1.10", "1.11.2"]
     container:
       image: crystallang/crystal:${{ matrix.crystal }}
     steps:

README.md

@@ -4,7 +4,7 @@
 <p vertical-align="middle"><h1>Exercism Crystal Track</h1></p>
 
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[![Discourse topics](https://img.shields.io/discourse/topics?color=8A08E6&label=Connect%20&labelColor=FFDF58&logo=Discourse&logoColor=8A08E6&server=https%3A%2F%2Fforum.exercism.org&style=social)](https://forum.exercism.org)
-&nbsp;[![Exercism_II](https://img.shields.io/badge/Exercism--Built-9101FF?logo=crystal&logoColor=000000&labelColor=E5E5E5&label=Crystal%201.9.2%20Powered)](https://exercism.org)
+&nbsp;[![Exercism_II](https://img.shields.io/badge/Exercism--Built-9101FF?logo=crystal&logoColor=000000&labelColor=E5E5E5&label=Crystal%201.11.2%20Powered)](https://exercism.org)
 &nbsp;[![Exercism_III](https://img.shields.io/badge/Open-11b30e?labelColor=3D454D&label=Contributions)](https://exercism.org/blog/freeing-our-maintainers) &nbsp;[![Build Status](https://github.com/exercism/crystal/workflows/Tests/badge.svg)](https://github.com/exercism/crystal/actions/workflows/tests.yml)
 
 <br>
@@ -16,7 +16,7 @@ Hi. &nbsp;👋🏽 &nbsp;👋 &nbsp;**We are happy you are here.**&nbsp; 🎉&nb
 **`exercism/Crystal`** is one of many programming language tracks on [exercism(dot)org][exercism-website].
 This repo holds all the instructions, tests, code, & support files for Crystal _exercises_ currently under development or implemented & available for students.
 
-🌟 &nbsp;&nbsp;Track tooling (_test-runner, representer, analyzer, and Continuous Integration_) runs on Crystal `1.10.1`. <br>
+🌟 &nbsp;&nbsp;Track tooling (_test-runner, representer, analyzer, and Continuous Integration_) runs on Crystal `1.11.2`. <br>
 🌟 &nbsp;&nbsp;Most exercises are solvable with Crystal `1.0.0` or higher.
 
 This track is made up of **Practice Exercises**. Practice exercises are open-ended, and can be used to practice concepts learned, try out new techniques, and play.
@@ -64,7 +64,7 @@ Please keep in mind [Chesterton's Fence][chestertons-fence].
 
 ## Crystal Software and Documentation
 
-**Copyright © 2012-2023 Manas Technology Solutions. All rights reserved.**
+**Copyright © 2012-2024 Manas Technology Solutions. All rights reserved.**
 
 Crystal software and documentation are licensed under the [Apache License v2.0][crystal-license].