Ignore subdirectories pattern

Hey folks,

Is there any way to ignore subdirectories based on the directory name? We currently have a lerna monorepo and I find it difficult to exclude multiple `node_modules` folders.

The optimal would be to use it like this
```
addlicense -c "Neo4j Inc." -f license.txt -check ./**/*.{js,ts,css} -ignore **/node_modules/*
```

but it doesn't seem to work.

The directories also are in the following tree structure

```
.
├── CONTRIBUTING.md
├── README.md
├── lerna.json
├── license.js
├── license.txt
├── node_modules
├── package.json
├── packages
│   ├── base
│   │   ├── node_modules
│   │   ├── package.json
│   │   ├── src
│   ├── html-storybook
│   │   ├── node_modules
│   │   ├── package.json
│   ├── react
│   │   ├── node_modules
│   │   ├── package.json
│   │   ├── src
│   │   └── tsconfig.json
│   └── react-storybook
│   ├── node_modules
│   ├── package.json
│   └── src
├── tsconfig.json
└── yarn.lock
```

Start by tracing how the addlicense command expands recursive directory patterns and applies the -ignore option. Reproduce the lerna-style tree with nested node_modules directories and test the reported command. Done means directory-name patterns such as **/node_modules/* reliably exclude those subdirectories while other matching files are still scanned.

Written by the indexing model from the issue text.