MacroF and MicroF integration to version 2.0

[thammegowda]

Updated #153 to version 2.0.0
Implementation of MacroF and MicroF used in "Macro-average rare types are important too paper" https://aclanthology.org/2021.naacl-main.90/

[thammegowda]

Here is a sample output

$ sacrebleu -m bleu macrof -lc dev.ref  < dev.sys1-002.hyp.txt
[
{
 "name": "BLEU",
 "score": 31.4,
 "signature": "nrefs:1|case:lc|eff:no|tok:13a|smooth:exp|version:2.0.0",
 "verbose_score": "67.0/40.0/26.1/17.6 (BP = 0.942 ratio = 0.943 hyp_len = 63220 ref_len = 67012)",
 "nrefs": "1",
 "case": "lc",
 "eff": "no",
 "tok": "13a",
 "smooth": "exp",
 "version": "2.0.0"
},
{
 "name": "MacroF1",
 "score": 34.9,
 "signature": "nrefs:1|case:lc|tok:13a|ngram:1|smooth:1.add-k|version:2.0.0",
 "nrefs": "1",
 "case": "lc",
 "tok": "13a",
 "ngram": "1",
 "smooth": "1.add-k",
 "version": "2.0.0",
 "precision": 63.1,
 "recall": 58.8,
 "len_ratio": 0.943,
 "hyp_len": 63220,
 "ref_len": 67012,
 "verbose_score": "precision = 63.1 recall = 58.8 len_ratio = 0.943 hyp_len = 63220 ref_len = 67012"
}
]

$ sacrebleu -m bleu macrof -lc dev.ref --format text < dev.sys1-002.hyp.txt
        BLEU|nrefs:1|case:lc|eff:no|tok:13a|smooth:exp|version:2.0.0 = 31.4 67.0/40.0/26.1/17.6 (BP = 0.942 ratio = 0.943 hyp_len = 63220 ref_len = 67012)
MacroF1|nrefs:1|case:lc|tok:13a|ngram:1|smooth:1.add-k|version:2.0.0 = 34.9 precision = 63.1 recall = 58.8 len_ratio = 0.943 hyp_len = 63220 ref_len = 67012