Update README.md

Author: subotkevic

README.md

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-# JSON Translation helper for Laravel
-Searches for translation keys – inserts into JSON translation files.
+# JSON Translation Helper for Laravel
+JSON Translation Helper scans your project for `__()`, `lang()` translation helper methods and `@lang` directives, then it creates keys in your JSON translation files. 
+
+And yes, it avoids duplicates – helper creates only non-existing keys. Ready for your translation.