Update eslint config

Author: tshemsedinov

.eslintignore

@@ -1 +1,2 @@
 node_modules/
+Exercises/

.eslintrc.json

@@ -113,6 +113,9 @@
     "new-parens": [
       "error"
     ],
+    "no-lonely-if": [
+      "error"
+    ],
     "no-trailing-spaces": [
       "error"
     ],
@@ -148,7 +151,7 @@
     "space-before-function-paren": [
       "error",
       {
-        "anonymous": "always",
+        "anonymous": "never",
         "named": "never",
         "asyncArrow": "always"
       }
@@ -259,13 +262,5 @@
       "error",
       "never"
     ]
-  },
-  "overrides": [
-    {
-      "files": ["1-let.js"],
-      "rules": {
-        "prefer-const": "off"
-      }
-    }
-  ]
-}
+  }
+}