Readme example doesn't compile with nim 0.10.2.
After installing with `nimble install jester` the example mentioned in the readme fails to compile. Same with the git checkout:

```
jester.nim(183, 44) Info: instantiation from here
jester.nim(188, 73) Error: undeclared identifier: '^'
```

The readme mentions 0.10.0 should be enough. Why do I have the feeling your modules rarely work with stable compiler versions…
