Fix bug when imported name contains assert

[riywo]

readToken checks after assert keyword, but it always true due to a bug.
This causes Unexpected token when the imported name contains assert.

fix preactjs/wmr#769

npm run test passes:

> [email protected] test
> mocha ./test/index.js

Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db

Why you should do it regularly:
https://github.com/browserslist/browserslist#browsers-data-updating
ok 1 acorn-import-assertions should parse duplicated-key
ok 2 acorn-import-assertions should parse dynamic-import-async-expression
ok 3 acorn-import-assertions should parse dynamic-import-with-assert
ok 4 acorn-import-assertions should parse dynamic-import-without-assert
ok 5 acorn-import-assertions should parse export-statement-all-as-type
ok 6 acorn-import-assertions should parse export-statement-all-type
ok 7 acorn-import-assertions should parse export-statement-default-as-type
ok 8 acorn-import-assertions should parse export-statement-type
ok 9 acorn-import-assertions should parse export-statement-without-assertions
ok 10 acorn-import-assertions should parse keyword-in-ident
ok 11 acorn-import-assertions should parse keyword-without-space
ok 12 acorn-import-assertions should parse type
ok 13 acorn-import-assertions should parse unsupported-key
ok 14 acorn-import-assertions should parse unsupported-value
ok 15 acorn-import-assertions should parse without-assertions
# tests 15
# pass 15
# fail 0
1..15

Note: This is still not enough to cover import assert from "foo" yet.

[marvinhagemeister]

Good catch! Thank you so much for making a PR 🙌

[riywo]

Can anyone approve the workflow?

[xtuc]

Good catch, thanks!

[xtuc]

published [email protected] with the changes. i'll update in webpack

[xtuc]

Did more fixes in 5f4e814.

and released [email protected]