Erratum

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- **NEW:** Error definitions can also be used as a context manager, useful
for when you only want the Error to catch exceptions in a particular block
of code rather than an entire function. e.g.

.. code-block:: python

with SqrtError():
math.sqrt(-1)

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- **CHANGED:** Cleaner syntax for annotating functions with errors you now
simply use the class name e.g.

.. code-block:: python

SqrtError
def mysqrt(x):
...

- **FIXED:** Text in the output of the erratum.document command now has the
proper indentation

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Initial release