chore(version): Update version and changelog 3.1.5

Author: ghenry

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [3.1.5] - 2023-02-15
 
 ### Added
 - Added the option conceal the bottom part of the introduction screen [PR#163](https://github.com/Pyozer/introduction_screen/pull/163) 

README.md

@@ -17,7 +17,7 @@ You just need to add `introduction_screen` as a [dependency in your pubspec.yaml
 
 ```yaml
 dependencies:
-  introduction_screen: ^3.1.4
+  introduction_screen: ^3.1.5
 ```
 
 ## Examples

pubspec.yaml

@@ -1,7 +1,7 @@
 name: introduction_screen
 description: Introduction/Onboarding package for flutter app with some customizations possibilities
 
-version: 3.1.4
+version: 3.1.5
 
 homepage: https://github.com/pyozer/introduction_screen