Update to version 5.6.6

Merge pull request #58 from danielinux/prepare-5.6.0-0

Updated ChangeLog.rst

Merge pull request #54 from danielinux/v5.5.4-rc

Preparing release 5.5.4

Merge pull request #53 from danielinux/build_improvements

Make several improvements to the CFFI build process.

Bump to version 5.4.0

Also move out some things that are now in wolfSSL CMake.

Update to 5.3.0

update to 'wolfssl-version-4.1.0-stable'

add better dealocators and bump wolfssl version to 3.14.2

updates docs

fixes tests and bumps release