updated solhint version

Author: sobolev-igor

package.json

@@ -38,7 +38,7 @@
     "eth-gas-reporter": "0.2.17",
     "ethlint": "1.2.5",
     "ganache-cli": "6.9.1",
-    "solhint": "2.3.1",
+    "solhint": "3.0.0-rc.8",
     "solidity-coverage": "0.7.4"
   }
 }