Cyrillic text doesn't displayed
**Describe the bug**
Cyrillic text doesn't displayed

**To Reproduce**
Run following code:
```
import pyxel

class App:
    def __init__(self):
        pyxel.init(160, 120)
        pyxel.run(self.update, self.draw)

    def update(self):
        if pyxel.btnp(pyxel.KEY_Q):
            pyxel.quit()

    def draw(self):
        pyxel.cls(0)
        pyxel.text(55, 41, 'Привет, мир!', 10)

App()
```

No text is displayed, only punctuations:
![image](https://user-images.githubusercontent.com/21060932/53719792-1882df00-3e70-11e9-9911-2b734021e0ce.png)

**Expected behavior**
Cyrillic text is displayed: "Привет, мир!"

**Configuration:**
 - OS: Win 10
 - Python 3.6
 - Pyxel 1.0.2

**Workaround**

I've wrote workaround script for cyrillic symbols: https://github.com/alderven/pyxel-cyrillic

![](https://raw.githubusercontent.com/alderven/pyxel-cyrillic/master/hello_world.png)