Update README.md

Author: nyavro

README.md

@@ -3,6 +3,7 @@
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/1ec904e969c348eeb9b1a010ab76d1b9)](https://app.codacy.com/manual/nyavro/i18nPlugin?utm_source=github.com&utm_medium=referral&utm_content=nyavro/i18nPlugin&utm_campaign=Badge_Grade_Dashboard)
 [![Build Status](https://travis-ci.com/nyavro/i18nPlugin.svg?branch=master)](https://travis-ci.com/nyavro/i18nPlugin)
 [![Hits-of-Code](https://hitsofcode.com/github/nyavro/i18nPlugin)](https://hitsofcode.com/view/github/nyavro/i18nPlugin)
+[![codecov](https://codecov.io/gh/nyavro/i18nPlugin/branch/master/graph/badge.svg)](https://codecov.io/gh/nyavro/i18nPlugin)
 
 Intellij idea i18next support plugin
 
@@ -38,4 +39,4 @@ Intellij idea i18next support plugin
 
 -   and to partially resolved keys:
 
-    ![Reference to plural value](docs/img/p7.png)
+    ![Reference to plural value](docs/img/p7.png)