update readme

README.md

@@ -31,7 +31,8 @@ original ones as well!).
  "babel/new-cap": 1,
  "babel/object-curly-spacing": 1,
  "babel/no-invalid-this": 1,
- "babel/semi": 1
+ "babel/semi": 1,
+ "babel/no-unused-expressions": 1
  }
 }
 ```
@@ -45,6 +46,7 @@ Each rule corresponds to a core `eslint` rule, and has the same options.
 - `babel/object-curly-spacing`: doesn't complain about `export x from "mod";` or `export * as x from "mod";` (🛠)
 - `babel/no-invalid-this`: doesn't fail when inside class properties (`class A { a = this.b; }`)
 - `babel/semi`: doesn't fail when using `for await (let something of {})`. Includes class properties (🛠)
+- `babel/no-unused-expressions`: doesn't fail when using do expressions
 
 #### Deprecated