Use TestValue instead of custom LabeledValue

src/spectator/matchers/labeled_value.cr

@@ -1,10 +0,0 @@
-module Spectator::Matchers
-  struct LabeledValue
-    getter label : Symbol
-
-    getter value : String
-
-    def initialize(@label, @value)
-    end
-  end
-end

src/spectator/matchers/matcher.cr

@@ -1,5 +1,6 @@
 require "./failed_matched_data"
 require "./successful_match_data"
+require "./test_value"
 
 module Spectator::Matchers
   # Common base class for all expectation conditions.