Preparing release 1.3.1.

Author: ezzatron

CHANGELOG.md

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+# WebDriver Manager changelog
+
+## 1.3.1 (2016-10-19)
+
+- **[FIXED]** Prevention of zombie processes, which affected termination of the
+  standalone server ([#11], [#14] - thanks [@jails]).
+
+[#11]: https://github.com/peridot-php/webdriver-manager/issues/11
+[#14]: https://github.com/peridot-php/webdriver-manager/pull/14
+
+<!-- References -->
+
+[@jails]: https://github.com/jails