Doesn't work with expecting an error/exception

I'm running a test where I'm expecting an exception eventually but rspec-eventually isn't working with it because it's failing due to the exception. Here's a simple example:

```
[1] pry()> expect {1/0}.to raise_exception(ZeroDivisionError)
=> true
[2] pry()> expect {1/0}.to eventually(raise_exception(ZeroDivisionError))
ZeroDivisionError: divided by 0
from (pry):2:in `/'
```
