SpecParser API update.

src/context.cr

@@ -250,7 +250,7 @@ class Package::Context
 	end
 
 	def read_configuration(filename : String)
-		specs = SpecParser.parse(filename)
+		specs = SpecParser.parse(File.read(filename))
 
 		specs.assignments.each do |key, value|
 			case key

src/recipe.cr

@@ -91,7 +91,7 @@ class Package::Recipe
 	end
 
 	def initialize(@context, filename : String)
-		specs = SpecParser.parse filename, {
+		specs = SpecParser.parse File.read(filename), {
 			"pkg" => fake_root_directory,
 			"prefix" => prefix
 		}