Use receive and let-optionals* from (chicken base)

[wasamasa]

This avoids a minor speed penalty.

[ThatGeoGuy]

Tests pass locally, this looks good! Thanks for submitting this, do you have any actual data on the speed increase?

I'd like to bump version and add some notes to the wiki.

[wasamasa]

chicken-install srfi-133 -test  0.19s user 0.03s system 64% cpu 0.341 total
chicken-install -test  0.17s user 0.02s system 95% cpu 0.203 total

Similar figures of 5-10% performance increases were found for the other two eggs redefining receive and let-optionals*, srfi-130 and srfi-152:

chicken-install srfi-130 -test  0.77s user 0.02s system 99% cpu 0.789 total
chicken-install -test  0.70s user 0.03s system 98% cpu 0.741 total
chicken-install srfi-152 -test  0.71s user 0.04s system 85% cpu 0.874 total
chicken-install -test  0.71s user 0.01s system 99% cpu 0.729 total

When I specifically tried to benchmark something like srfi-130's string-unfold by running four different invocations for 100k times, there's a difference of 50-100ms.