Merge pull request #96 from arduino/update_ci_tests

msic: Update CI tests.

Merge pull request #93 from arduino/new_se_support

ussl: Add support for sign callback on MicroPython.

Merge pull request #88 from arduino/ci_tests

tests: Update CI test.

misc: Bump firmware version.

Merge pull request #84 from arduino/ssl_ctx_attr

misc: Fix exceptions on missing attributes on MicroPython.

Merge pull request #83 from arduino/update_readme

misc: Update README.md.

Merge pull request #79 from arduino/ssl_context

ucloud: Switch to SSLConext.

Merge pull request #77 from arduino/update_deps

misc: Update CPython dependencies.

Merge pull request #76 from arduino/update_examples

examples: Add async WiFi connection example.

Merge pull request #66 from arduino/m2crypto_fix

ussl: Clean up SSL and m2crypto code.