introduced changelog, updated version to 1.2.0

CHANGELOG.md

@@ -0,0 +1,27 @@
+# Changelog
+
+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
+- none, yet
+
+
+## [1.2.0] - 2020-04-16
+- Added possibility to define your own timeouts for clicks (as suggested by [cmeldas](https://github.com/cmeldas) in [#10](https://github.com/LennartHennigs/Button2/issues/10))
+- Removed ```yield()``` in main ```loop()``` since it caused some problems
+- Created and added CHANGELOG.md 
+
+
+## [1.1.0] - 2020-03-27
+- Changed the private functions to protected (as suggested by [Nagymadar](https://github.com/Nagymadar) in [#9](https://github.com/LennartHennigs/Button2/issues/9))
+- Added support for active high buttons (as suggested by [Nagymadar](https://github.com/Nagymadar) in [#8](https://github.com/LennartHennigs/Button2/issues/8))
+- Added ```reset()``` function to unset all functions (as suggested by [Nagymadar](https://github.com/Nagymadar) in [#7](https://github.com/LennartHennigs/Button2/issues/7))
+- Added a ```yield()``` command to the main ```loop()```
+- Changed the times for double and triple click
+- Fixed error in ```SingleButton.ino``` (as suggested by [alexthe-red](https://github.com/alexthe-red) in [#3](https://github.com/LennartHennigs/Button2/issues/3))
+- Added the library to the Arduino IDE
+
+
+## [1.0.0] - 2017-11-09
+- initial release

library.json

@@ -7,7 +7,7 @@
 		"type": "git",
 		"url": "https://github.com/LennartHennigs/Button2"
 	},
-	"version": "1.1.0",
+	"version": "1.2.0",
 	"authors": {
 		"name": "Lennart Hennigs",
 		"url": "https://lennarthennigs.de"

library.properties

@@ -1,5 +1,5 @@
 name=Button2
-version=1.1.0
+version=1.2.0
 author=Lennart Hennigs
 maintainer=Lennart Hennigs <mail@lennarthennigs.de>
 sentence=Arduino Library to simplify working with buttons.