fix(crystal): update samples

Author: n-rodriguez

samples/client/petstore/crystal/shard.yml

@@ -16,5 +16,8 @@ development_dependencies:
     version: ~>1.5.0
   ameba:
     github: crystal-ameba/ameba
+  spectator:
+    gitlab: arctic-fox/spectator
+    version: ~> 0.12.0
 
 license: 

samples/client/petstore/crystal/spec/spec_helper.cr

@@ -9,8 +9,9 @@
 #
 
 # load modules
-require "spec"
+require "spectator"
 require "json"
+require "time"
 require "../src/petstore"
 
 def assert_compilation_error(path : String, message : String) : Nil

samples/client/petstore/crystal/src/petstore/models/format_test.cr

@@ -127,7 +127,7 @@ module Petstore
       end
 
       if @password.to_s.size < 10
-        invalid_properties.push("invalid value for \"password\", the character length must be great than or equal to 10.")
+        invalid_properties.push("invalid value for \"password\", the character length must be greater than or equal to 10.")
       end
 
       pattern = Regexp.new(/^\d{10}$/)
@@ -253,7 +253,7 @@ module Petstore
       end
 
       if password.to_s.size < 10
-        raise ArgumentError.new("invalid value for \"password\", the character length must be great than or equal to 10.")
+        raise ArgumentError.new("invalid value for \"password\", the character length must be greater than or equal to 10.")
       end
 
       @password = password