Bump acorn from 4.0.13 to 7.1.1

[dependabot]

Bumps acorn from 4.0.13 to 7.1.1.

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[ci-reporter]

The build is failing

✨ Good work on this PR so far! ✨ Unfortunately, the Travis CI build is failing as of b88392c. Here's the output:

npm test

> [email protected] pretest /home/travis/build/pugjs/pug-lint
> npm run docs && npm run schema && npm run lint


> [email protected] docs /home/travis/build/pugjs/pug-lint
> pliers buildRuleDocs

8:44:28 PM info buildRuleDocs Started
8:44:28 PM info buildRuleDocs Completed [10ms]

> [email protected] schema /home/travis/build/pugjs/pug-lint
> pliers buildJsonSchema

8:44:29 PM info buildJsonSchema Started
module.js:478
    throw err;
    ^

Error: Cannot find module 'acorn/dist/walk'
    at Function.Module._resolveFilename (module.js:476:15)
    at Function.Module._load (module.js:424:25)
    at Module.require (module.js:504:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/travis/build/pugjs/pug-lint/lib/rules/validate-template-string.js:43:17)
    at Module._compile (module.js:577:32)
    at Object.Module._extensions..js (module.js:586:10)
    at Module.load (module.js:494:32)
    at tryModuleLoad (module.js:453:12)
    at Function.Module._load (module.js:445:3)

npm ERR! Linux 4.15.0-1028-gcp
npm ERR! argv "/home/travis/.nvm/versions/node/v6.17.1/bin/node" "/home/travis/build/pugjs/pug-lint/node_modules/.bin/npm" "run" "schema"
npm ERR! node v6.17.1
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! [email protected] schema: `pliers buildJsonSchema`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] schema script 'pliers buildJsonSchema'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the pug-lint package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     pliers buildJsonSchema
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs pug-lint
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls pug-lint
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/travis/build/pugjs/pug-lint/npm-debug.log

I'm sure you can fix it! If you need help, don't hesitate to ask a maintainer of the project!

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