Small text changes - trailing spaces and update year (mattermost#6022)

* remove trailing spaces

* update year

CHANGELOG.md

@@ -1,3 +1,3 @@
 # Mattermost Changelog
 
-Please see [Mattermost Team Edition Changelog](http://docs.mattermost.com/administration/changelog.html) in product documentation. 
+Please see [Mattermost Team Edition Changelog](http://docs.mattermost.com/administration/changelog.html) in product documentation.

CONTRIBUTING.md

@@ -1,12 +1,12 @@
 # Code Contribution Guidelines
 
-Thank you for your interest in contributing! Please see the [Mattermost Contribution Guide](http://docs.mattermost.com/developer/contribution-guide.html) which describes the process for making code contributions across Mattermost projects. 
+Thank you for your interest in contributing! Please see the [Mattermost Contribution Guide](http://docs.mattermost.com/developer/contribution-guide.html) which describes the process for making code contributions across Mattermost projects.
 
 ### Review Process for this Repo
 
 When you submit a pull request, it goes through the review process outlined below. We aim to start reviewing pull requests in this repo the week they are submitted, but the length of time to complete the process will vary depending on the pull request.
 
-The one exception may be around release time, where the review process may take longer as the team focuses on our [release process](https://docs.mattermost.com/process/release-process.html). 
+The one exception may be around release time, where the review process may take longer as the team focuses on our [release process](https://docs.mattermost.com/process/release-process.html).
 
 #### PR submitted
 

ISSUE_TEMPLATE.md

@@ -1,7 +1,7 @@
-For feature requests, please see: http://www.mattermost.org/feature-requests/.  
+For feature requests, please see: http://www.mattermost.org/feature-requests/.
 For troubleshooting questions, please post on the forums: http://forum.mattermost.org/.
 
-For issues with the product, please follow the steps at http://www.mattermost.org/filing-issues/ and post here in the following format: 
+For issues with the product, please follow the steps at http://www.mattermost.org/filing-issues/ and post here in the following format:
 
 #### Summary
 Issue in one concise sentence

LICENSE.txt

@@ -1,32 +1,32 @@
 Mattermost Licensing
 
-SOFTWARE LICENSING 
+SOFTWARE LICENSING
 
-You are licensed to use compiled versions of the Mattermost platform produced by Mattermost, Inc. under an MIT LICENSE 
+You are licensed to use compiled versions of the Mattermost platform produced by Mattermost, Inc. under an MIT LICENSE
 
 -	See MIT-COMPILED-LICENSE.md included in compiled versions for details
 
 You may be licensed to use source code to create compiled versions not produced by Mattermost, Inc. in one of two ways:
 
-1. Under the Free Software Foundation’s GNU AGPL v.3.0, subject to the exceptions outlined in this policy; or 
-2. Under a commercial license available from Mattermost, Inc. by contacting [email protected] 
+1. Under the Free Software Foundation’s GNU AGPL v.3.0, subject to the exceptions outlined in this policy; or
+2. Under a commercial license available from Mattermost, Inc. by contacting [email protected]
 
-You are licensed to use the source code in Admin Tools and Configuration Files (templates/, config/, model/, 
+You are licensed to use the source code in Admin Tools and Configuration Files (templates/, config/, model/,
 webapp/client, webapp/fonts, webapp/i18n, webapp/images and all subdirectories thereof) under the Apache License v2.0.
 
-We promise that we will not enforce the copyleft provisions in AGPL v3.0 against you if your application (a) does not 
+We promise that we will not enforce the copyleft provisions in AGPL v3.0 against you if your application (a) does not
 link to the Mattermost Platform directly, but exclusively uses the Mattermost Admin Tools and Configuration Files, and
-(b) you have not modified, added to or adapted the source code of Mattermost in a way that results in the creation of 
+(b) you have not modified, added to or adapted the source code of Mattermost in a way that results in the creation of
 a “modified version” or “work based on” Mattermost as these terms are defined in the AGPL v3.0 license.
 
 MATTERMOST TRADEMARK GUIDELINES
 
-Your use of the mark Mattermost is subject to Mattermost, Inc's prior written approval and our organization’s Trademark 
-Standards of Use at http://www.mattermost.org/trademark-standards-of-use/. For trademark approval or any questions 
-you have about using these trademarks, please email [email protected] 
+Your use of the mark Mattermost is subject to Mattermost, Inc's prior written approval and our organization’s Trademark
+Standards of Use at http://www.mattermost.org/trademark-standards-of-use/. For trademark approval or any questions
+you have about using these trademarks, please email [email protected]
 
 ------------------------------------------------------------------------------------------------------------------------------
-                               
+
                                Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/