Changelogs for the Slack Add-on

The format is based on [Keep a Changelog](https://keepachangelog.com/) and this project adheres to [Semantic Versioning](https://semver.org/). = [1.5.0] - 2019-09-11 = * Feature: Added a new theme for notifications, an option to display a short notification with less information; * Feature: Added 3 new buttons to the "Full" theme, for Viewing, Editing or Commenting right after the notification text; * Feature: Added new filters for customizing the Slack channel, Username, Avatar and Text of notifications; = [1.4.4] - 2019-02-20 = * Fixed translations for PT-BR; * Removed files added by mistake to the package; * Removed the legacy license key fields in the settings tab; * Fix fatal error in wp-admin when active alongside WPML or another plugin that uses an obsolete version of the Twig library; * Updated minimum required patch version of PublishPress to 1.20.0; * Fix warning about undefined channel property; = [1.4.3] - 2019-02-11 = * Fixed translations for PT-BR; * Removed files added by mistake to the package; * Removed the legacy license key fields in the settings tab; = [1.4.2] - 2019-01-14 = * Fixed the workflow id sanitizing before store in the DB. = [1.4.1] - 2018-04-18 = *Fixes:* * Fixed edit link on notifications (thanks Davis Shaver); * Fixed icon on notifications (thanks Davis Shaver); * Fixed duplicated timestamp on notifications (thanks Davis Shaver); *Changed:* * Removed description text from module's page; = [1.4.0] - 2018-04-05 = *Changed:* * Changed to support new PublishPress 1.11.0 with Roles instead of User Groups; *Fixed:* * Fixed broken HTML on messages displayed if PublishPress is not enabled; * Fixed error looking for EDD include file; * Fixed PHP Warnings about undefined property; = [1.3.0] - 2018-02-22 = *Added:* * Added support for async notifications on PublishPress; *Changed:* * Changed minimum required PublishPress version to 1.10.0; = [1.2.3] - 2018-02-07 = *Fixed:* * Fixed license key validation and automatic update; *Changed:* * Finished rebranding for PublishPress; = [1.2.2] - 2018-01-26 = *Changed:* * Updated plugin headers; = [1.2.1] - 2018-01-26 = *Changed:* * Rebranded for PublishPress; * Increased max time execution time when sending notification; = [1.2.0] - 2017-08-31 = *Added:* * Added a new filter allowing to block the execution of the plugin; * Added support for the new notification workflows on PublishPress; * Added field on the user's profile to configure the Slack channel for each workflow; *Changed:* * Changed the label for the "Service URL" field to "Webhook URL" to match the Slack's site strings; * Disabled the Freemius integration; * Renamed the field "Channel" to "Default channel" on the settings; * Changed the required minimum version of PublishPress to 1.7.2; = [1.1.0] - 2017-06-21 = *Added:* * Added pt-BR translations * Added POT file for translations *Fixed:* * Fixed PHP warnings after install and activate * Fixed the link for the Slack hook creation * Fixed the license and update checker *Changed:* * Updated the Tested Up to 4.8 = [1.0.0] - 2017-05-25 = * First version