fix(tn): add >= <= (#155)

Author: xingchensong

tn/chinese/rules/math.py

@@ -32,5 +32,6 @@ def build_tagger(self):
         number = Cardinal().number
         tagger = (number + ((delete(' ').ques + operator + delete(' ').ques +
                              number).plus).ques)
+        tagger |= operator
         tagger = insert('value: "') + tagger + insert('"')
         self.tagger = self.add_tokens(tagger)

tn/chinese/test/data/normalizer.txt

@@ -39,3 +39,4 @@ B2B => B to B
 雪の花 => 雪<oov>の</oov>花
 给12315打个电话 => 给幺二三幺五打个电话
 人均200以内 => 人均两百以内
+当场票数≥100万 => 当场票数大于等于一百万