added a changelog file (#19)

.changelog

@@ -0,0 +1,13 @@
+<?php
+declare(strict_types=1);
+
+use ChangelogGenerator\ChangelogConfig;
+
+return [
+    (new ChangelogConfig(
+        'narrowspark',
+        'http-emitter',
+        '0.7.0',
+        ['Added', 'Changed', 'Deprecated', 'Removed', 'Fixed', 'Security']
+    ))
+];

CHANGELOG.md

@@ -0,0 +1,22 @@
+0.7.0
+=====
+
+- Total issues resolved: **0**
+- Total pull requests resolved: **3**
+- Total contributors: **2**
+
+Added
+-----
+
+ - [15: flush output buffers and disconnect](https://github.com/narrowspark/http-emitter/pull/15) thanks to @mindplay-dk
+
+Changed
+-------
+
+ - [18: upgraded narrowspark/coding-standard v1.4.0](https://github.com/narrowspark/http-emitter/pull/18) thanks to @prisis
+
+Fixed
+-----
+
+ - [17: avoid use of multi-byte string functions](https://github.com/narrowspark/http-emitter/pull/17) thanks to @mindplay-dk
+