version 1.0.0 could not be published to PyPI due to missing blank
line at end of README.

otherwise CI might fail as it just happened...

otherwise cannot be uploaded to PyPI

old unit was [m], new unit is [mm]
default value changed from 0.2269148577394744 to 226.9148577394744

renamed `adjust_rho_max_wet_snowpack` in
commit d573fa42
and forgot to change the name in the test.

This reverts commit 89675958.

add function for unit conversion which can be tested and is less error
prone for any future developments

feat: add unit conversion to `convert_2d` function

Closes #9

See merge request !9

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