release v4.2.1

Implement Unicode Support

closes #93

* fix full-width characters issue (magmax/python-inquirer#432)

* Fix the issue that raises a bunch of OSError exceptions in the test script (#93)

* Fix UnicodeEncodeError when inputting emojis

* add tests for new unicode support

drop python 3.7, as its EOL

add OpenBSD to the list of supported platforms

closes #103

fix f370fea

the commit intredouced `tee` to put variables into the `$GITHUB_ENV`
This was a great idea, but we must allways _append_ to the vfile, not
override it. This is fixed now by usign the `-a` option

Merge branch 'master' into py-typed

make the new class public