Updated README file and contributing guidelines

Author: Despical

.github/README.md

@@ -193,7 +193,7 @@ public class ExampleClass extends JavaPlugin {
 ## Contributing
 
 I accept Pull Requests via GitHub. There are some guidelines which will make applying PRs easier for me:
-+ Ensure you didn't use spaces! Please use tabs for indentation.
++ Ensure you didn't use tabs! Please use spaces for indentation.
 + Respect the code style.
 + Do not increase the version numbers in any examples files and the README.md to the new version that this Pull Request would represent.
 + Create minimal diffs - disable on save actions like reformat source code or organize imports. If you feel the source code should be reformatted create a separate PR for this change.

CONTRIBUTING.md

@@ -8,7 +8,7 @@ Please note we have a code of conduct, please follow it in all your interactions
 If you want to help this project and don't know where to start, check out the [currently opened issues](https://github.com/Despical/CommandFramework/issues)
 before creating any PRs. Because there are people that could use your help.
 
-* Ensure you didn't use spaces! Please use tabs for indentation.
+* Ensure you didn't use tabs! Please use spaces for indentation.
 * Respect the code style.
 * Do not increase the version numbers in any examples files and the README.md to the
   new version that this Pull Request would represent.