Merge pull request #393 from ffftp/release-v58

Release v58

Merge pull request #376 from ffftp/release-v57

Release v57

Merge pull request #355 from ffftp/release-v56

update to v5.6.

Merge pull request #346 from ffftp/release-v551

update to v5.5.1.

Merge pull request #343 from ffftp/release-v55

update to v5.5.

Merge pull request #325 from ffftp/release-v54

update to v5.4.

Merge pull request #312 from ffftp/release-v53

update to v5.3.

Merge pull request #311 from ffftp/release-493

update to v4.9.3.

Merge pull request #299 from ffftp/release-52

update to v5.2.

Merge pull request #298 from ffftp/release-492

update to v4.9.2.