chore(babel-plugin-espower): adjust with ArrowFunctionExpression output format change

Author: twada

test/fixtures/ArrowFunctionExpression/expected.js

@@ -1,20 +1,12 @@
 'use strict';
 
-assert(function (v) {
-  return v + 1;
-});
+assert(v => v + 1);
 
-assert(function (v, i) {
-  return v + i;
-});
+assert((v, i) => v + i);
 
-assert(function (v) {
-  return { even: v, odd: v + 1 };
-});
+assert(v => ({ even: v, odd: v + 1 }));
 
-assert(assert._expr(assert._capt(assert._capt(seven, 'arguments/0/left') === assert._capt((function (v, i) {
-  return v + i;
-})(assert._capt(four, 'arguments/0/right/arguments/0'), assert._capt(five, 'arguments/0/right/arguments/1')), 'arguments/0/right'), 'arguments/0'), {
+assert(assert._expr(assert._capt(assert._capt(seven, 'arguments/0/left') === assert._capt(((v, i) => v + i)(assert._capt(four, 'arguments/0/right/arguments/0'), assert._capt(five, 'arguments/0/right/arguments/1')), 'arguments/0/right'), 'arguments/0'), {
   content: 'assert(seven === ((v, i) => v + i)(four, five))',
   filepath: 'test/fixtures/ArrowFunctionExpression/fixture.js',
   line: 9