spell_correct.py代码有误，附纠错

92和93行代码应改为：
```python
92 word_pinyin = self.p.get_pinyin(word, splitter=' ')
93 candidate_pinyin = self.candidates(word_pinyin.split(" "))
```
62行代码应改为：
```python
62 return (self.known(word) or self.known(self.edits1(word)) or self.known(self.edits2(word)) or word)
```