Added `subFactorial()` method

JordanRL / Fermat

A library providing math and statistics operations for numbers of arbitrary size.

GNU General Public License v2.0

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Closed JordanRL closed 3 years ago

JordanRL commented 3 years ago

[closes #95]

Added the subFactorial() method to IntegerMathTrait, along with corresponding tests to ImmutableDecimalTest.
Updated composer.json to put ext-bcmath back in. It's installed by default, but not included in core.
Fixed a test for factorial() dealing with one of the exceptions