Babel Block Scoping Transform -- Scope Bindings are not renamed

.babelrc

{
  "plugins": ["babel-plugin-transform-es2015-block-scoping", "./plugin"]
}

package.json

{
  "name": "babel-let",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "babel-core": "^6.5.1",
    "babel-plugin-transform-es2015-block-scoping": "^6.5.0"
  }
}

plugin.js

module.exports = function () {
  const callVisitor = function(path){
    path.node.arguments.forEach(arg => {
      console.log("Name: " + arg.name + ". Bindings in scope: " + Object.keys(path.scope.bindings));
    });
  };

  return {
    visitor: {
      CallExpression: callVisitor
    }
  };
}

src.js

"use strict";
function myFn1(a, b) {
}
if (true) {
    let myFn1 = function(c) {
    };
    doSomething(myFn1);
}
doSomething(myFn1);

babel src.js

Name: _myFn. Bindings in scope: myFn1
Name: myFn1. Bindings in scope: myFn1
"use strict";

function myFn1(a, b) {}
if (true) {
    var _myFn = function (c) {};
    doSomething(_myFn);
}
doSomething(myFn1);