Merge pull request #205 from akrherz/v201

rls: Denote 2.0.1 Release

update release in pyproject.toml

Merge pull request #177 from akrherz/v1_11_0

denote METAR 1.11.0 release

Merge pull request #173 from akrherz/v1_10_0

denote 1.10.0 release

Merge pull request #159 from akrherz/v190

denote 1.9.0 release

Merge pull request #128 from akrherz/1.8.0

denote release 1.8.0

Merge pull request #79 from akrherz/release_0_17

make 1.7.0 release of python-metar

Merge pull request #57 from akrherz/release_0_16

make 1.6.0 release of python-metar

Added release notes for v1.4 release

Updated to use str() method, rather than string()