Update CHANGELOG for 1.0.1 release

Changelog for v1.0.0

Merge pull request tfutils#77 from kamatama41/release-v0.6.0

Release v0.6.0

Merge pull request tfutils#63 from kamatama41/release-v0.5.2

Release v0.5.2

Merge pull request tfutils#61 from kamatama41/release-v0.5.1

Release v0.5.1

Merge pull request tfutils#59 from kamatama41/release-v0.5.0

Release v0.5.0

Merge pull request tfutils#57 from kamatama41/release-0.4.4

Release 0.4.4

Merge pull request tfutils#45 from kamatama41/tfenv-0.4.3-rc2

Tfenv 0.4.3 rc2

Merge pull request tfutils#40 from kamatama41/release-0.4.2

Update to 0.4.2

Merge pull request tfutils#35 from cartest/master

Additional development of latest. Bash standards. Revert to upstream README.md. Add CHANGELOG.md. Develop Test Suite.