ExternalCommandBuilder not backwards compatible

[soda480]

The latest version of pybuilder 0.12.0 requires a new positional argument for ExternalCommandBuilder which causes all of our existing builds to fail with TypeError: __init__() missing 1 required positional argument: 'reactor':

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/pybuilder/cli.py", line 468, in main
    environments=options.environments, tasks=arguments)
  File "/usr/local/lib/python3.6/site-packages/pybuilder/reactor.py", line 235, in build
    execution_summary = self.build_execution_plan(tasks, execution_plan)
  File "/usr/local/lib/python3.6/site-packages/pybuilder/reactor.py", line 274, in build_execution_plan
    reactor=self)
  File "/usr/local/lib/python3.6/site-packages/pybuilder/execution.py", line 399, in execute_execution_plan
    summaries.append(self.execute_task(task, **kwargs))
  File "/usr/local/lib/python3.6/site-packages/pybuilder/execution.py", line 346, in execute_task
    task.execute(self.logger, kwargs, _executable=_executable)
  File "/usr/local/lib/python3.6/site-packages/pybuilder/execution.py", line 187, in execute
    executable.execute(argument_dict)
  File "/usr/local/lib/python3.6/site-packages/pybuilder/execution.py", line 101, in execute
    self.callable(*arguments)
  File "./build.py", line 52, in cyclomatic_complexity
    command = ExternalCommandBuilder('radon', project)
TypeError: __init__() missing 1 required positional argument: 'reactor'

[arcivanov]

Yep, it does. Reactor can be passed to any task, initializer or action as one of the parameters and can in turn be fed into ExternalCommandBuilder.
I'll add this change to the migration guide.