Add Crystal 1.16.0 (#1567)

Author: HertzDevil

bin/yaml/crystal.yaml

@@ -19,6 +19,7 @@ compilers:
       -   ln -s /opt/compiler-explorer/libs/libevent/2.1.12/x86_64/lib/libevent.a
       - fi
     targets:
+      - 1.16.0
       - 1.15.1
       - name: 1.14.1
         build: 3