Nu Release Updates

1st chunk of `blog/2020-04-03-twin0032.md`

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# This week in Nu #32

- DrSensor worked on the docker builds (#1540)
- jonathandturner released 0.12.0 (#1538), changed `get` to remove blanks (#1534)
- Amanita-muscaria added the ability to configure table headers (#1537)
- thegedge fixed the error message for bad permissions when executing commands (#1535), improved the `du` command (#1533), added interruptible streams (#1531)
- samhedin added the `headers` command (#1530)
- jonstodle added support for CARGO_TARGET_DIR (#1528)

Title: Nu Release Updates - Week #32

Summary

This week in Nu, DrSensor worked on docker builds, jonathandturner released 0.12.0 and changed 'get' to remove blanks, Amanita-muscaria configured table headers, thegedge fixed error messages and improved 'du' command, and samhedin added the 'headers' command. jonstodle added support for CARGO_TARGET_DIR.