Move ROOT_CONTEXT out of Spectator module

src/spectator.cr

@@ -4,8 +4,6 @@ require "./spectator/*"
 module Spectator
   VERSION = "0.1.0"
 
-  ROOT_CONTEXT = Context.new("ROOT")
-
   macro describe(what, source_file = __FILE__, source_line = __LINE__, &block)
     module Spectator
       module Examples
@@ -15,6 +13,6 @@ module Spectator
   end
 
   at_exit do
-    Runner.new(ROOT_CONTEXT).run
+    Runner.new(Context::ROOT).run
   end
 end

src/spectator/context.cr

@@ -2,6 +2,8 @@ require "./example"
 
 module Spectator
   class Context
+    ROOT = Context.new("ROOT")
+
     getter what : String
     getter parent : Context?
     getter examples = [] of Example

src/spectator/examples.cr

@@ -4,7 +4,7 @@ module Spectator
   module Examples
     include ::Spectator::DSL
 
-    CURRENT_CONTEXT = Spectator::ROOT_CONTEXT
+    CURRENT_CONTEXT = ::Spectator::Context::ROOT
     CONTEXT_MODULE = ::Spectator::Examples
     GIVEN_VARIABLES = [] of Object