raise informative error when ruamel.yaml is missing due to ruamel_yaml #51
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conda ruamel_yaml fork can prevent pip installing ruamel.yaml dependency, so raise an informative error about how to fix this when it (probably) occurs.
alternative to #48 which tries to use the forked package instead.
Since there's a clear, easy workaround for conda and the bug is in the conda ruamel_yaml package (hopefully fixed in the future by conda-forge/ruamel_yaml-feedstock#68), I think this informative error which tells you exactly how to fix the problem is preferable to using the different package, which can come with its own issues over time.
closes #48