Using bash, with the recommended eval "$(frum init)" in .bashrc results in cd returning a failure exit code whenever you cd into a directory that does not contain a .ruby-version file.

This breaks any type of shell pipeline that expects to chain commands together (e.g. using bash's $$ operator).

Steps to reproduce:

In a bash shell without having eval'd frum init

1. cd to a directory without a .ruby-version file (e.g. /tmp) with a following command, e.g. cd /tmp && touch a
2. eval "$(frum init)"
3. repeat command 1 with a different filename, e.g. cd /tmp && touch b

Expected behaviour

Both files a and b should be created in the destination directory

Observed behaviour

Only a is created, because once frum is installed cd returns 1 because it is returning the exit code of frum local rather than the underlying cd command.