Merge pull request #2442 from andrew-demb/patch-1

📖 Actualize link to plugin development guide

Author: Haehnchen

README.md

@@ -65,7 +65,7 @@ Building, debugging and other
 * Choose `View > Tool Windows > Gradle`
 * Double click `idea-php-symfony2-plugin > Tasks > intellij > runIde`
 
-If you are having difficulties, consult the documentation: http://confluence.jetbrains.com/display/PhpStorm/Setting-up+environment+for+PhpStorm+plugin+development
+If you are having difficulties, consult the documentation: https://plugins.jetbrains.com/docs/intellij/phpstorm.html
 
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