Initial code to get match data values to output

Expose the match data values through the Expectation class.

src/spectator/expectations/expectation.cr

@@ -18,6 +18,12 @@ module Spectator::Expectations
       @match_data.matched? ^ @negated
     end
 
+    # Information about the match.
+    # Returned value and type will something that has key-value pairs (like a `NamedTuple`).
+    def values
+      @match_data.values
+    end
+
     # Text that indicates the condition that must be met for the expectation to be satisifed.
     def expected_message
       @negated ? @match_data.negated_message : @match_data.message

src/spectator/formatters/failure_block.cr

@@ -61,8 +61,15 @@ module Spectator::Formatters
     private def values(io)
       io.puts
       indent do
-        line(io) { io << "Expected: TODO" }
-        line(io) { io << "     got: TODO" }
+        @result.expectations.each_unsatisfied do |expectation|
+          expectation.values.each do |key, value|
+            line(io) do
+              io << key
+              io << ": "
+              io << value
+            end
+          end
+        end
       end
       io.puts
     end