docs: Update Changelog.md (#623)

Update the changelog to the same version the release-tag-system has

CHANGELOG.md

@@ -1,3 +1,39 @@
+
+# [1.9.0](https://github.com/showdownjs/showdown/compare/1.8.7...1.9.0) (2018-11-10)
+
+Version 1.9.0 introduces a new feature, the Markdown to HTML converter. This feature is still experimental and is a partial backport of the new Reverse Converter planned for version 2.0.
+### Bug Fixes
+
+* **italicsAndBold:** fix issue with consecutive spans ([#608](https://github.com/showdownjs/showdown/issues/608)) ([5c0d67e](https://github.com/showdownjs/showdown/commit/5c0d67e)), closes [#544](https://github.com/showdownjs/showdown/issues/544)
+* **underline:** fix issue with consecutive spans ([81edc70](https://github.com/showdownjs/showdown/commit/81edc70))
+
+### Features
+
+* **converter.makeMarkdown:** [EXPERIMENTAL] add an HTML to MD converter ([e4b0e69](https://github.com/showdownjs/showdown/commit/e4b0e69)), closes [#388](https://github.com/showdownjs/showdown/issues/388) [#233](https://github.com/showdownjs/showdown/issues/233)
+
+<a name="1.8.7"></a>
+# [1.8.7](https://github.com/showdownjs/showdown/compare/1.8.6...1.8.7) (2018-10-16)
+
+### Bug Fixes
+
+* **emojis:** fix emoji excessive size ([4aca41c](https://github.com/showdownjs/showdown/commit/4aca41c))
+* **gfm-codeblocks:** add support for spaces before language declaration ([24bf7b1](https://github.com/showdownjs/showdown/commit/24bf7b1)), closes [#569](https://github.com/showdownjs/showdown/issues/569)
+leading space no longer breaks gfm codeblocks ([828c32f](https://github.com/showdownjs/showdown/commit/828c32f)), closes [#523](https://github.com/showdownjs/showdown/issues/523)
+
+* **images:** fix js error when using image references ([980e702](https://github.com/showdownjs/showdown/commit/980e702)), closes [#585](https://github.com/showdownjs/showdown/issues/585)
+* **literalMidWordAsterisks:** now parses single characters enclosed by * correctly ([fe70e45](https://github.com/showdownjs/showdown/commit/fe70e45)), closes [#478](https://github.com/showdownjs/showdown/issues/478)
+* **mentions:** allow for usernames with dot, underscore and dash ([dfeb1e2](https://github.com/showdownjs/showdown/commit/dfeb1e2)), closes [#574](https://github.com/showdownjs/showdown/issues/574)
+* **nbsp:** fix replacing of nbsp with regular spaces ([8bc1f42](https://github.com/showdownjs/showdown/commit/8bc1f42))
+
+<a name="1.8.6"></a>
+# [1.8.6](https://github.com/showdownjs/showdown/compare/1.8.5...1.8.6) (2017-12-22)
+
+### Features
+
+* **splitAdjacentBlockquotes:** add option to split adjacent blockquote blocks ([da328f2](https://github.com/showdownjs/showdown/commit/da328f2)), closes [#477](https://github.com/showdownjs/showdown/issues/477)
+
+
+
 <a name="1.8.5"></a>
 # [1.8.5](https://github.com/showdownjs/showdown/compare/1.8.4...1.8.5) (2017-12-10)