disable enum_reflection on GCC 8 and earlier versions

[bbbgan]

No description provided.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fa13af7) 44.79% compared to head (0224ccd) 44.79%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #222   +/-   ##
=======================================
  Coverage   44.79%   44.79%           
=======================================
  Files          45       45           
  Lines        5449     5449           
=======================================
  Hits         2441     2441           
  Misses       3008     3008           

Files Changed	Coverage Δ
iguana/enum_reflection.hpp	100.00% <ø> (ø)
iguana/xml_writer.hpp	91.66% <ø> (ø)
iguana/yaml_reader.hpp	100.00% <ø> (ø)
test/test.cpp	100.00% <ø> (ø)
test/test_util.cpp	100.00% <ø> (ø)
test/test_xml.cpp	100.00% <ø> (ø)
test/test_yaml.cpp	100.00% <ø> (ø)
test/unit_test.cpp	99.68% <ø> (ø)

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