try to fix version number(like 5.4.0) to chinese error

[lvscar]

The PR try to fix error when we got a sentence have version number(like 5.4.0) in it. eg: "本周，小鹏就将发布天玑 5.4.0 系统。"

for issue: #164

[lvscar]

fix result:

 print(f"5: {number_to_chinese('5')}")    
 print(f"1.2: {number_to_chinese('1.2')}")
 print(f"2.3.4: {number_to_chinese('2.3.4')}")    

5: 五
1.2: 一点二
2.3.4: 二点三点四