chalk docker autocomplete fails with command not found

[indecisivedragon]

Description

When trying to use autocomplete on a chalk docker command, seeing the error bash: _chalk_docker_completions: command not found:

./chalk docker build -f tests/functional/data/dockerfiles/valid/sample_1/Dockerfile tests/functional/data/dockerfiles/valibash: _chalk_docker_completions: command not found

Impact

cannot autocomplete filepaths for docker, may be related to #80

Steps to Reproduce

1. type chalk docker build -f into bash terminal
2. hit tab key
3. observe error