Fixed links in CONTRIBUTING.md
Fixed links in CONTRIBUTING.md

subdee/myportugal,subdee/myportugal,tibrus/yii2-app-advanced,erycamel/yii2-app-advanced,mobilejazz/yii2-mj-cms-example,AnTAVR/yii2-app-advanced-ru,yiisoft/yii2-app-advanced,AnTAVR/yii2-app-advanced-ru,yiijan/yii2-app-advanced,githubjeka/yii2-app-advanced,erycamel/yii2-app-advanced,yiisoft/yii2-app-advanced,urmaul/yii2-app-advanced-mongodb,dmitry-kulikov/yii2-app-advanced,mobilejazz/yii2-mj-cms-example,yiijan/yii2-app-advanced,AnTAVR/yii2-app-advanced-ru,nikbas/yii2-app-advanced,cophiel/YII2-Learning,Somefive/Athena,dmitry-kulikov/yii2-app-advanced,Somefive/Athena,cophiel/YII2-Learning,dixonsatit/yii2-dixon-starter,githubjeka/yii2-app-advanced,nikbas/yii2-app-advanced,dixonsatit/yii2-dixon-starter