Lock to Crystal 1.4 or later (#12)

Author: jwoertink

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
       fail-fast: false
       matrix:
         crystal_version:
-          - 1.0.0
+          - 1.4.0
           - latest
         experimental:
           - false

shard.yml

@@ -4,7 +4,7 @@ version: 0.1.1
 authors:
   - Jeremy Woertink <jeremywoertink@gmail.com>
 
-crystal: ">= 1.0.0"
+crystal: ">= 1.4.0"
 
 license: MIT
 
@@ -21,4 +21,4 @@ development_dependencies:
     branch: master
   ameba:
     github: crystal-ameba/ameba
-    version: ~> 0.14.3
+    version: ~> 1.0.0