Update solidity-coverage

package.json

@@ -47,6 +47,6 @@
     "eslint-plugin-node": "5.1.0",
     "eslint-plugin-react": "7.5.1",
     "solhint": "1.1.10",
-    "solidity-coverage": "0.4.15"
+    "solidity-coverage": "0.5.0"
   }
 }