Rakefile.rspec.tt in hanami-0.8.0

- old
+ new

@@ -1,6 +1,9 @@
 require 'rake'
 require 'hanami/rake_tasks'
-require 'rspec/core/rake_task'
 
-RSpec::Core::RakeTask.new(:spec)
-task default: :spec
+begin
+  require 'rspec/core/rake_task'
+  RSpec::Core::RakeTask.new(:spec)
+  task default: :spec
+rescue LoadError
+end