Readme links to Miss Manners benchmark implementation are wrong

Links point to the incorrect location, e.g. 

```markdown
* [Python](https://github.com/jruizgit/rules/blob/testpy/manners.py)
```

instead of 

```markdown
* [Python](https://github.com/jruizgit/rules/blob/master/testpy/manners.py)
```

which leads users to 404 page. 