- Update to version 6.8.0+git20230604.4050f566:
* fix mis-spelling for head docs
* Update readthedocs notes in the how-to-release page (#1308)
* release 6.8.0 docs
* post-6.8.0
* Update go version in .github/workflows/release.yml
* go mod tidy
* miller 6.8.0
* Unify the `case` verb, and add options (#1306)
* Values-only `-a` option for `mlr grep` (#1305)
* Bump github/codeql-action from 2.3.5 to 2.3.6 (#1303)
* Bump github.com/stretchr/testify from 1.8.3 to 1.8.4 (#1301)
* Bump github/codeql-action from 2.3.4 to 2.3.5 (#1300)
* Bump github/codeql-action from 2.3.3 to 2.3.4 (#1299)
* Bump github.com/mattn/go-isatty from 0.0.18 to 0.0.19 (#1296)
* Bump github.com/stretchr/testify from 1.8.2 to 1.8.3 (#1295)
* Bump actions/setup-go from 4.0.0 to 4.0.1 (#1294)
* Let `mlr help` take pre-flags, such as `--always-color` (#1292)
* New `mlr json-parse -k` flag (#1291)
* Bump golang.org/x/term from 0.7.0 to 0.8.0 (#1285)
* Bump github/codeql-action from 2.3.2 to 2.3.3 (#1284)

- Update to version 6.7.0+git20230501.6c86ef19:
* Bump codespell-project/actions-codespell (#1282)
* Bump github/codeql-action from 2.3.1 to 2.3.2 (#1279)
* Bump github/codeql-action from 2.3.0 to 2.3.1 (#1277)
* Bump github/codeql-action from 2.2.12 to 2.3.0 (#1274)
* Implement `--csv-trim-leading-space` flag (#1272)
* Fix precedence of coalesce operators `??` and `???` (#1270)
* Treaet data-file numbers with leading + as numeric (#1269)