semver not available in runtime environment, reverted #129

[fredvd]

@ericof You merged #129 , but semver is not available on runtime. @sneridagh Tried to fix this by using a hook install semver, but couldn't get it working, so I reverted the change for now.

The tests didn't catch this because they are using the requirement.txt to install semver, this does not happen when I call the template from a locally installed cookiecutter. Trying a hook to install it using pipx assumes / binds the template to using pipx always, but this doesn't have to be the case.

The most straightforward solution would imho be to make semver a dependency of cookiecutter itself and give it a new release. But cookiecutter seems to be lean on (no?) dependencies itself.

[davisagli]

Fixed in #132