Log Message:
Update to 2.500

Upstream changes:
2.500 2018-10-06
        - update to Unicode 10.0.0
        - Net::IDN::UTS46: remove workarounds for pre-9.0.0 test vectors; the
          module now more closely follows the written spec
        - Net::IDN::UTS46: fix validation for some non-valid characters
        - Net::IDN::UTS46: for perl 5.8.x/5.10.x, include workaround for bidi
          validation where some labels would incorrectly be marked as invalid
          [B1] because of a bug in perl's Unicode implementation
        - Net::IDN::Punycode: fix for warnings under perl ≤ 5.8.7 (EXPERIMENTAL)