Print the literal code nodes-to-string is choking on

[MynockSpit]

This is a really dumb edit -- just pass down the content we're parsing from the top and do a slice (so as not to modify the original) on it. I was finding it challenging to read the AST and figure out what/where was breaking. With this, I can at least to a search in my package for the string.

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included
• documentation is changed or added

 PASS  test/jsx-parser.js 5 OK 44.865ms
test/parser.js 2> i18next-scanner: "none" does not exist in the namespaces (["translation"]): key="key2", options={}
 PASS  test/parser.js 69 OK 944.745ms
test/transform-stream.js 2> (node:97914) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
 PASS  test/transform-stream.js 55 OK 736.272ms

                         
  🌈 SUMMARY RESULTS 🌈  
                         

Suites:   3 passed, 3 of 3 completed
Asserts:  129 passed, of 129
Time:     8s
------------------------|----------|----------|----------|----------|-------------------|
File                    |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
------------------------|----------|----------|----------|----------|-------------------|
All files               |    91.68 |    88.08 |    98.68 |    91.27 |                   |
 acorn-jsx-walk.js      |      100 |       50 |    85.71 |      100 |              7,21 |
 flatten-object-keys.js |      100 |       90 |      100 |      100 |                22 |
 index.js               |    98.44 |      100 |      100 |    98.39 |                96 |
 nodes-to-string.js     |     81.4 |       75 |      100 |    80.95 |... 29,54,60,61,62 |
 omit-empty-object.js   |      100 |    83.33 |      100 |      100 |                25 |
 parser.js              |    91.01 |    88.92 |      100 |    90.48 |... 60,762,763,848 |
------------------------|----------|----------|----------|----------|-------------------|