`no-mocha-arrows` fix produces invalid code with comments

[gabssnake]

Hi, thanks for your work, love this eslint-plugin :)

I encountered an issue where some code, admittedly very bad, produces invalid output after fixing no-mocha-arrows.

it("writes code in strange ways", () =>
  // This is a disaster waiting to happen
    assert(true)
);

When running eslint --fix it produces output:

it("writes code in strange ways", function ()// This is a disaster waiting to happen { return assert(true)
});

Here's a failing test case (not sure of the expected code) :

+++ b/test/rules/no-mocha-arrows.js
@@ -31,6 +31,11 @@ ruleTester.run('no-mocha-arrows', rules['no-mocha-arrows'], {
+        {
+            code: 'it(() => \n//hello\nassert(hello, false))',
+            errors,
+            output: 'it(function() {\n//hello\nreturn assert(hello, false); })'
+        },

Do you have any pointers for a fix? I'll be happy to contribute!

Kind regards,