Crystal is now community supported on Travis CI

.travis.yml

@@ -1,9 +1,4 @@
-language: c
-before_install: |
-  curl http://dist.crystal-lang.org/apt/setup.sh | sudo bash
-  sudo apt-get -q update
-install: |
-  sudo apt-get install crystal
+language: crystal
 script:
   - crystal build crisp.cr
   - crystal spec