Request contributors to sign a CLA is probably not a good idea.

[latin-1]

There were a lot of discussions about "why CLA is not a good idea for open source projects" that I don't want to repeat again, but for this project, there are some other reasons:

1. Request contributors to sign a non-exist CLA has no effect, really.
2. You didn't force contributors to sign a CLA at the beginning of this project. In order to make CLA work as you expected, you probably need to request everyone who has already contributed to this project to sign a CLA, which is much difficult.

I wish you could reconsider this decision, thanks.