Update README.md

Author: ManukMinasyan

README.md

@@ -1,4 +1,6 @@
-# VueJS Functional Calendar (Date Picker, Date Range) [![Financial Contributors on Open Collective](https://opencollective.com/vue-functional-calendar/all/badge.svg?label=financial+contributors)](https://opencollective.com/vue-functional-calendar) [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Lightweight,%20high%20performance%20calendar%20component%20based%20on%20Vue.js&url=https://github.com/ManukMinasyan/vue-functional-calendar&via=github&hashtags=vue,calendar,design,developers)
+# VueJS Functional Calendar (Date Picker, Date Range) 
+[![Buy us a tree](https://img.shields.io/badge/Treeware-%F0%9F%8C%B3-lightgreen?style=for-the-badge)](https://offset.earth/treeware?gift-trees)
+[![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Lightweight,%20high%20performance%20calendar%20component%20based%20on%20Vue.js&url=https://github.com/ManukMinasyan/vue-functional-calendar&via=github&hashtags=vue,calendar,design,developers)
 
 [![Build Status](https://travis-ci.org/ManukMinasyan/vue-functional-calendar.svg?branch=master)](https://travis-ci.org/ManukMinasyan/vue-functional-calendar)
 [![Version](https://img.shields.io/npm/v/vue-functional-calendar.svg)](https://www.npmjs.com/package/vue-functional-calendar)
@@ -185,33 +187,3 @@ For example: <FunctionalCalendar ref="Calendar"></FunctionalCalendar>
     ✅ this.$refs.Calendar.ChooseDate('25/09/2020'); //Call method implementation to go to a date
 ````
 ___
-
-## Contributors
-
-### Code Contributors
-
-This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
-<a href="https://github.com/ManukMinasyan/vue-functional-calendar/graphs/contributors"><img src="https://opencollective.com/vue-functional-calendar/contributors.svg?width=890&button=false" /></a>
-
-### Financial Contributors
-
-Become a financial contributor and help us sustain our community. [[Contribute](https://opencollective.com/vue-functional-calendar/contribute)]
-
-#### Individuals
-
-<a href="https://opencollective.com/vue-functional-calendar"><img src="https://opencollective.com/vue-functional-calendar/individuals.svg?width=890"></a>
-
-#### Organizations
-
-Support this project with your organization. Your logo will show up here with a link to your website. [[Contribute](https://opencollective.com/vue-functional-calendar/contribute)]
-
-<a href="https://opencollective.com/vue-functional-calendar/organization/0/website"><img src="https://opencollective.com/vue-functional-calendar/organization/0/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/1/website"><img src="https://opencollective.com/vue-functional-calendar/organization/1/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/2/website"><img src="https://opencollective.com/vue-functional-calendar/organization/2/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/3/website"><img src="https://opencollective.com/vue-functional-calendar/organization/3/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/4/website"><img src="https://opencollective.com/vue-functional-calendar/organization/4/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/5/website"><img src="https://opencollective.com/vue-functional-calendar/organization/5/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/6/website"><img src="https://opencollective.com/vue-functional-calendar/organization/6/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/7/website"><img src="https://opencollective.com/vue-functional-calendar/organization/7/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/8/website"><img src="https://opencollective.com/vue-functional-calendar/organization/8/avatar.svg"></a>
-<a href="https://opencollective.com/vue-functional-calendar/organization/9/website"><img src="https://opencollective.com/vue-functional-calendar/organization/9/avatar.svg"></a>