Kalimaha / pact-test / 153

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Better syntax for Eithers

Either class overrides `__rshift__` magic method to allow the usage of `>>` to cancatenate several functions. Example:

```python
def test_break_the_chain():
    out = minus_one(1) >> one_divided_by >> minus_one
    assert out.value == "Division by zero."
```

The `concat` function remains to allow the concatenation of functions that require more than one input parameter. Example:

```python
def test_multiple_parameters():
    out = minus_one(9).concat(my_sum, 5)
    assert out.value == 13

def my_sum(a, b):
    return Right(a + b)
```

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