Envvar compare not working well when envvar end with "\n"

Write config like this:

```rb
project "github/username/repo" do
  env(
    "KEY" => "test\n"
  )
end
```

Then apply, we got results:

```
=== github/username/repo

Progress(dry-run): |
�[0;33;49m  ~ update KEY=xxxx
# <= newline is appears here
```

It seems CircleCI remove "\n", so we need to chomp it.