Update changelog for 2.1.0 release. (#1823)

Update changelog for 2.0.1 release. (#1797)

Update changelog for 2.0.0 release. (#1789)

Update changelog for 1.41.0 release. (#1788)

Remove ClassicalExpBox and related methods.

Update changelog for 1.40.0 release. (#1766)

Fix conversion of `ClOp.BitEq` and `ClOp.BitNeq` to QASM (#1754)

Update changelog for 1.39.0 release. (#1741)

Fix typo.

Use trusted publishing for releases.