TypeError: token.attrGet is not a function

```bash
"TypeError: token.attrGet is not a function",
" at /home1/user/61916c91a4e81be8/node_modules/markdown-it-anchor/index.js:79:24",
" at Array.forEach (native)",
" at Array. (/home1/user/61916c91a4e81be8/node_modules/markdown-it-anchor/index.js:71:8)",
" at Core.process (/home1/user/61916c91a4e81be8/node_modules/markdown-it/lib/parser_core.js:51:13)",
" at MarkdownIt.parse (/home1/user/61916c91a4e81be8/node_modules/markdown-it/lib/index.js:493:13)",
" at MarkdownIt.render (/home1/user/61916c91a4e81be8/node_modules/markdown-it/lib/index.js:513:36)",
" at decorate (/home1/user/61916c91a4e81be8/node_modules/aglio-theme-olio/lib/main.js:422:44)",
" at Object.exports.render (/home1/user/61916c91a4e81be8/node_modules/aglio-theme-olio/lib/main.js:646:5)",
" at /home1/user/61916c91a4e81be8/node_modules/aglio/lib/main.js:133:20"
```

The above error occurs due to the fact that `markdown-it-anchor` has released `v2.7.0` which introduces some breaking changes.

The following works fine:

```
`-- grunt-aglio@0.4.1
`-- aglio@2.2.1
`-- aglio-theme-olio@1.6.3
`-- markdown-it-anchor@2.5.0
```

`v2.6.0` works fine, too.

But this new `v2.7.0` fails.

```
└─┬ grunt-aglio@0.4.1
└─┬ aglio@2.2.1
└─┬ aglio-theme-olio@1.6.3
└── markdown-it-anchor@2.7.0
```

Some clever people here at `aglio` didn't care enough to set the exact version requirement in its [package.json](https://github.com/danielgtaylor/aglio/blob/olio-theme/package.json#L42).

Please, always use the exact version.

Start with the dependency declaration in package.json at the linked line and compare it with the dependency trees showing markdown-it-anchor 2.5.0, 2.6.0, and 2.7.0. Reproduce the aglio rendering failure, then verify that the dependency is pinned to a compatible exact version and the TypeError no longer occurs.

Written by the indexing model from the issue text.