Allow nio4r's complex license (#16)

Each of these licenses is permitted, but license_finder is unable to understand the expression, so we'll explicitly allow it.

See:

* powerhome/power-tools#217
* pivotal/LicenseFinder#1012

license_rules.yml

@@ -125,3 +125,10 @@
  :why: 'Permitted for all use cases: https://tech.powerhrg.com/oss-guide/docs/using/permitted-licenses.html\#permitted-licenses'
  :versions: []
  :when: 2023-08-15 01:13:00.000000000 Z
+- - :permit
+ - MIT AND (BSD-2-Clause OR GPL-2.0-or-later)
+ - :who: Ben Langfeld <[email protected]>
+ :why: Each of these licenses is permitted, but license_finder is unable to understand
+ the expression. See https://github.com/pivotal/LicenseFinder/issues/1012.
+ :versions: []
+ :when: 2024-01-09 14:11:44.344657000 Z