feat: Allow project-level config

[delucis]

It would be useful if linter-dryer’s settings could be overridden on a per-project basis.

For example, a project could provide a .dryer.yml config file that could look like the following:

# .dryer.yml duplicating current defaults
minimumLines: 3
minimumTokens: 25
linterScope: file
ignoreFiles:
  - .gitignore
exclude:
  - "**/*.min.*"
severity: info