npm WARN EBADENGINE...
$ **npm install --save rate-limiter-flexible**
```
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'boom@0.3.8',
npm WARN EBADENGINE   required: { node: '0.8.x' },
npm WARN EBADENGINE   current: { node: 'v15.4.0', npm: '7.3.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'cryptiles@0.1.3',
npm WARN EBADENGINE   required: { node: '0.8.x' },
npm WARN EBADENGINE   current: { node: 'v15.4.0', npm: '7.3.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'dns@0.2.2',
npm WARN EBADENGINE   required: { node: '>= 0.10.0 < 0.11.0' },
npm WARN EBADENGINE   current: { node: 'v15.4.0', npm: '7.3.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'hawk@0.10.2',
npm WARN EBADENGINE   required: { node: '0.8.x' },
npm WARN EBADENGINE   current: { node: 'v15.4.0', npm: '7.3.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'hoek@0.7.6',
npm WARN EBADENGINE   required: { node: '0.8.x' },
npm WARN EBADENGINE   current: { node: 'v15.4.0', npm: '7.3.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'tomahawk@0.1.6',
npm WARN EBADENGINE   required: { node: '>= 0.8.0 < 0.11.0' },
npm WARN EBADENGINE   current: { node: 'v15.4.0', npm: '7.3.0' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'sntp@0.1.4',
npm WARN EBADENGINE   required: { node: '0.8.x' },
npm WARN EBADENGINE   current: { node: 'v15.4.0', npm: '7.3.0' }
npm WARN EBADENGINE }

added 1 package, removed 446 packages, and audited 754 packages in 1m

42 packages are looking for funding
  run `npm fund` for details

35 vulnerabilities (5 low, 14 moderate, 16 high)

To address issues that do not require attention, run:
  npm audit fix

To address all issues (including breaking changes), run:
  npm audit fix --force

Run `npm audit` for details.
```