Add changelog entry on 90c9dd1d, 757891ed and 89203568

Add changelog entry on 90c9dd1d, 757891ed and 89203568

Sample (not ideal - could be *SO* much better ) timings from included bencher:

Before (0.0828xx):
62951 byte-long query generated (via as_query()) in: 4.975237 seconds (take 1)
62951 byte-long query generated (via as_query()) in: 4.995723 seconds (take 2)
62951 byte-long query generated (via as_query()) in: 4.964793 seconds (take 3)
62951 byte-long query generated (via as_query()) in: 4.96168 seconds (take 4)
62951 byte-long query generated (via as_query()) in: 4.991396 seconds (take 5)
62951 byte-long query generated (via as_query()) in: 4.988478 seconds (take 6)
62951 byte-long query generated (via as_query()) in: 4.977612 seconds (take 7)
62951 byte-long query generated (via as_query()) in: 4.98648 seconds (take 8)
62951 byte-long query generated (via as_query()) in: 4.999984 seconds (take 9)

After:
62951 byte-long query generated (via as_query()) in: 0.429634 seconds (take 1)
62951 byte-long query generated (via as_query()) in: 0.416169 seconds (take 2)
62951 byte-long query generated (via as_query()) in: 0.430782 seconds (take 3)
62951 byte-long query generated (via as_query()) in: 0.416879 seconds (take 4)
62951 byte-long query generated (via as_query()) in: 0.426492 seconds (take 5)
62951 byte-long query generated (via as_query()) in: 0.428975 seconds (take 6)
62951 byte-long query generated (via as_query()) in: 0.413018 seconds (take 7)
62951 byte-long query generated (via as_query()) in: 0.428731 seconds (take 8)
62951 byte-long query generated (via as_query()) in: 0.413206 seconds (take 9)