Add CHANGELOG

Author: STRML

CHANGELOG.md

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+## v2.0.1 (Mar 29, 2021)
+
+### Bugfixes
+
+* Add checks on spaces before and after bytes
+  * This will now throw an exception when spaces are present like ' 1.2.3.4' or '1. 2.3.4' or '1.2.3.4 '.
+
+### Internal Changes
+
+* Rewrite byte parsing without using JS `parseInt()`
+* Avoid some useless memory allocations
+* New Mocha testing suite, thanks @kaoudis [#36](https://github.com/rs/node-netmask/pull/36)
+
+## v2.0.0 (Mar 19, 2021)
+
+### Breaking Change
+
+Previous API was treating IPs with less than for bytes as IP with a
+netmask of the size of the provided bytes (1=8, 2=16, 3=24) and was
+interpreting the IP as if it was completed with 0s on the right side.
+
+*Proper IP parsing for these is to consider missing bytes as being 0s on
+the left side.*
+
+Mask size is no longer infered by the number of bytes provided.
+
+This means that the input `216.240` will no longer be interpreted as `216.240.0.0/16`, but as `0.0.216.240/32`,
+as per convention.
+
+See [the change](https://github.com/rs/node-netmask/commit/9f9fc38c6db1a682d23289b5c9dc2009d957a00b).
+
+### Bugfixes
+
+* Fix improper parsing of hex bytes
+
+## v1.1.0 (Mar 18, 2021)
+
+### IMPORTANT: Security Fix
+
+> This version contains an important security fix. If you are using netmask `<=1.0.6`, please upgrade to `1.1.0` or above.
+
+* Fix improper parsing of octal bytes ([commit](https://github.com/rs/node-netmask/commit/4678fd840ad0b4730dbad2d415712c0782e886cc))
+  * This is [CVE-2021-28918](https://sick.codes/sick-2021-011).
+  * See also the [npm advisory](https://www.npmjs.com/advisories/1658)
+
+### Other Changes
+
+* Performance: Avoid large allocations when provided large netmasks (like `/8`)
+  * Thanks @dschenkelman [#34](https://github.com/rs/node-netmask/pull/34)
+
+## v1.0.6 (May 30, 2016)
+
+* Changes before this release are not documented here. Please see [the commit list](https://github.com/rs/node-netmask/commits/master)
+  or the [compare view](https://github.com/rs/node-netmask/compare/1.0.5...rs:1.0.6).