Update parse_taxonomy.R

[jthmiller]

Added 'd' to gsub regular expression to remove 'd__' that is used in some formats instead of 'k__' (such as the mitofish reference)

[bingli2019]

In some case, when using "D_\\d__" is not work. so, it if can be changed to "[Dd]__" or not. I changed it and find ok