Bump elliptic from 6.5.4 to 6.5.7 in /js-bindings (#462)

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.4 to
6.5.7.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/indutny/elliptic/commit/3e46a48fdd2ef2f89593e5e058d85530578c9761"><code>3e46a48</code></a>
6.5.7</li>
<li><a
href="https://github.com/indutny/elliptic/commit/accb61e9c1a005e5c8ff96a8b33893100bb42d11"><code>accb61e</code></a>
lib: DER signature decoding correction</li>
<li><a
href="https://github.com/indutny/elliptic/commit/03e06e135c8e44a2da560fa197d0ba1e1e2759e9"><code>03e06e1</code></a>
6.5.6</li>
<li><a
href="https://github.com/indutny/elliptic/commit/7ac5360118f74eb02da73bdf9f24fd0c72ff5281"><code>7ac5360</code></a>
Merge commit from fork</li>
<li><a
href="https://github.com/indutny/elliptic/commit/75700785ff41bb5d029d19186beff26d4883caa5"><code>7570078</code></a>
6.5.5</li>
<li><a
href="https://github.com/indutny/elliptic/commit/206da2ee373e68466cde353f81fb59ef251b740b"><code>206da2e</code></a>
lib: lint</li>
<li><a
href="https://github.com/indutny/elliptic/commit/0a78e0399ee1f5d919be6aa66b427c67a9df330d"><code>0a78e03</code></a>
[Fix] restore node &lt; 4 compat</li>
<li>See full diff in <a
href="https://github.com/indutny/elliptic/compare/v6.5.4...v6.5.7">compare
view</a></li>
</ul>
</details>
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