Bump version to 0.18.0, add changelog (#1046)

Author: jsfehler

docs/news/0.18.0.rst

@@ -0,0 +1,26 @@
+.. Copyright 2021 splinter authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.
+
+.. meta::
+    :description: New splinter features on version 0.18.0.
+    :keywords: splinter 0.18.0, news
+
+What's New in Splinter 0.18.0?
+==============================
+
+Added:
+* WebDriverElement() now implements the `shadow_root` property. This returns a ShadowRootElement() object to interact with the shadow root of an element.
+* Failed driver imports are logged at the debug level instead of silently ignored
+* `browser.html_snapshot()` now takes the optional `unique_file` argument. Setting this to False will disable the addition of random characters to the filename.
+
+Changed:
+* repr(ElementList()) now returns the repr of the internal container.
+* Driver.find_link_by_<x> methods have been removed. Use Driver.links.find_by_<x>.
+* Screenshot taken by WebDriverElement.screenshot() now implements Selenium's element screenshot instead of cropping a full page screenshot.
+* Flask/Django's back/forward methods more accurately store browsing history
+* Official Python 3.6 support has been removed
+
+Fixed:
+* 0.17.0 would report as 0.16.0. 0.18.0 reports correctly.
+* When using Firefox, extensions can now be installed

splinter/version.py

@@ -1,2 +1,2 @@
-__version_info__ = (0, 17, 0)
+__version_info__ = (0, 18, 0)
 __version__ = '.'.join(map(str, __version_info__))