Added serbian cyrylic and latin (#15)

Added serbian cyrylic and latin from gradzio:feature/added-serbian-languages

composer.json

@@ -30,4 +30,4 @@
   "require-dev": {
     "phpunit/phpunit": "^6"
   }
-}
+}

resources/sr-Cyrl/sr-Cyrl.json

@@ -0,0 +1 @@
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