pull request welcomed :)

i am not currently using this buildpack so i don't know what's the best, current way of installing it

i'm thinking a encodingDefaults object around here: https://github.com/koajs/compress/blob/master/lib/encodings.js#L18

that gets deep-merged with options on initialization

iirc one isn't set, but i'll take a PR to have a lower default

Bumps lodash from 4.17.15 to 4.17.19. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/lodash/lodash/releases">lodash's releases</a>.</em></p> <blockquote> <h2>4.17.16</h2> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/lodash/lodash/commit/d7fbc52ee0466a6d248f047b5d5c3e6d1e099056"><code>d7fbc52</code></a> Bump to v4.17.19</li> <li><a href="https://github.com/lodash/lodash/commit/2e1c0f22f425e9c013815b2cd7c2ebd51f49a8d6"><code>2e1c0f2</code></a> Add npm-package</li> <li><a href="https://github.com/lodash/lodash/commit/1b6c282299f4e0271f932b466c67f0f822aa308e"><code>1b6c282</code></a> Bump to v4.17.18</li> <li><a href="https://github.com/lodash/lodash/commit/a370ac81408de2da77a82b3c4b61a01a3b9c2fac"><code>a370ac8</code></a> Bump to v4.17.17</li> <li><a href="https://github.com/lodash/lodash/commit/1144918f3578a84fcc4986da9b806e63a6175cbb"><code>1144918</code></a> Rebuild lodash and docs</li> <li><a href="https://github.com/lodash/lodash/commit/3a3b0fd339c2109563f7e8167dc95265ed82ef3e"><code>3a3b0fd</code></a> Bump to v4.17.16</li> <li><a href="https://github.com/lodash/lodash/commit/c84fe82760fb2d3e03a63379b297a1cc1a2fce12"><code>c84fe82</code></a> fix(zipObjectDeep): prototype pollution (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4759">#4759</a>)</li> <li><a href="https://github.com/lodash/lodash/commit/e7b28ea6cb17b4ca021e7c9d66218c8c89782f32"><code>e7b28ea</code></a> Sanitize sourceURL so it cannot affect evaled code (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4518">#4518</a>)</li> <li><a href="https://github.com/lodash/lodash/commit/0cec225778d4ac26c2bac95031ecc92a94f08bbb"><code>0cec225</code></a> Fix lodash.isEqual for circular references (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4320">#4320</a>) (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4515">#4515</a>)</li> <li><a href="https://github.com/lodash/lodash/commit/94c3a8133cb4fcdb50db72b4fd14dd884b195cd5"><code>94c3a81</code></a> Document matches* shorthands for over* methods (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4510">#4510</a>) (<a href="https://github-redirect.dependabot.com/lodash/lodash/issues/4514">#4514</a>)</li> <li>Additional commits viewable in <a href="https://github.com/lodash/lodash/compare/4.17.15...4.17.19">compare view</a></li> </ul> </details> <details> <summary>Maintainer changes</summary> <p>This version was pushed to npm by <a href="https://www.npmjs.com/~mathias">mathias</a>, a new releaser for lodash since your current version.</p> </details> <br />

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