update eslintrc according to master branch

Author: Amir-61

.eslintrc

@@ -6,8 +6,9 @@
       "ignoreUrls": true,
       "ignorePattern": "^\\s*var\\s.+=\\s*(require\\s*\\()|(/)"
     }],
-    // NOTE(bajtos) we should eventuall remove this override
+    // NOTE we should eventually remove this override
     // and fix all of those 100+ violations
-    "one-var": "off"
+    "one-var": "off",
+    "no-unused-expressions": "off"
   }
-}
+}