[BUG] Installing in REPL breaks _ builtin

[The-Compiler]

Describe the bug
When using from rich import pretty; pretty.install(), the _ (last result) functionality of Python's REPL breaks.

To Reproduce

Without rich:

>>> 5 + 10
15
>>> _ / 2
7.5

With rich:

>>> from rich import pretty
>>> pretty.install()
>>> 5 + 10
15
>>> _ / 2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name '_' is not defined

When rich is installed after the first expression:

>>> 1300 + 36
1336
>>> from rich import pretty
>>> pretty.install()
>>> 21 * 2
42
>>> _ + 1
1337

Platform
Linux, rich 5.1.2 and 5.2.0, Python 3.8.5

[willmcgugan]

Please try v5.2.1

[The-Compiler]

Looks good now - thanks for the quick fix! 👍