Merge #1965

1965: Bump memmap2 from 0.1.0 to 0.2.0 r=syrusakbary a=dependabot[bot]

Bumps [memmap2](https://github.com/RazrFalcon/memmap2-rs) from 0.1.0 to 0.2.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/RazrFalcon/memmap2-rs/blob/master/CHANGELOG.md">memmap2's changelog</a>.</em></p>
<blockquote>
<h2>0.2.0 - 2020-12-19</h2>
<h3>Changed</h3>
<ul>
<li>MSRV is 1.31 now (edition 2018).</li>
<li>Make anonymous memory maps private by default on unix. Thanks to <a href="https://github.com/CensoredUsername">@CensoredUsername</a>.</li>
<li>Add <code>map_copy_read_only</code>. <a href="https://github.com/zserik">@zserik</a>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/RazrFalcon/memmap2-rs/commit/f96c44f42d0abe4086599f2a9d197bebc7b8c5a8"><code>f96c44f</code></a> Version bump.</li>
<li><a href="https://github.com/RazrFalcon/memmap2-rs/commit/a02369b44b06095e97db8bf213d41a2ddaa55ddd"><code>a02369b</code></a> Make anonymous memory maps private by default on unix.</li>
<li><a href="https://github.com/RazrFalcon/memmap2-rs/commit/cc7a606898fd2251de0c9bce799089b89d3ef3f6"><code>cc7a606</code></a> Add map_copy_read_only.</li>
<li><a href="https://github.com/RazrFalcon/memmap2-rs/commit/dd6b68a5757fed3885b99147e57a8caf66c819d2"><code>dd6b68a</code></a> Fix readme.</li>
<li><a href="https://github.com/RazrFalcon/memmap2-rs/commit/9250eab3fadf55dbfc22dd87cf83d3635698a363"><code>9250eab</code></a> (CI) Move to GitHub Actions.</li>
<li><a href="https://github.com/RazrFalcon/memmap2-rs/commit/b8e15987a86a1ffd9f596c6fe0bff0295d17b298"><code>b8e1598</code></a> (CI) Remove old iOS targets.</li>
<li>See full diff in <a href="https://github.com/RazrFalcon/memmap2-rs/compare/v0.1.0...v0.2.0">compare view</a></li>
</ul>
</details>
<br />


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lib/engine/Cargo.toml

@@ -18,7 +18,7 @@ target-lexicon = { version = "0.11", default-features = false }
 # flexbuffers = { path = "../../../flatbuffers/rust/flexbuffers", version = "0.1.0" }
 backtrace = "0.3"
 rustc-demangle = "0.1"
-memmap2 = "0.1.0"
+memmap2 = "0.2.0"
 more-asserts = "0.2"
 thiserror = "1.0"
 serde = { version = "1.0", features = ["derive", "rc"] }