Add Crystal 1.18.1 and 1.17.1 (#1870)

Author: HertzDevil

bin/yaml/crystal.yaml

@@ -19,6 +19,8 @@ compilers:
       -   ln -s /opt/compiler-explorer/libs/libevent/2.1.12/x86_64/lib/libevent.a
       - fi
     targets:
+      - 1.18.1
+      - 1.17.1
       - 1.17.0
       - 1.16.3
       - 1.15.1