Consistent naming of random seed

src/spectator/config.cr

@@ -37,7 +37,7 @@ module Spectator
       @fail_blank = builder.fail_blank?
       @dry_run = builder.dry_run?
       @randomize = builder.randomize?
-      @random_seed = builder.seed
+      @random_seed = builder.random_seed
       @profile = builder.profile?
       @example_filter = builder.example_filter
     end

src/spectator/config_builder.cr

@@ -14,7 +14,7 @@ module Spectator
     end
 
     # Seed used for random number generation.
-    property seed : UInt64 = Random.rand(UInt64)
+    property random_seed : UInt64 = Random.rand(UInt64)
 
     @primary_formatter : Formatting::Formatter?
     @additional_formatters = [] of Formatting::Formatter