[Snyk] Security upgrade xlsx from 0.7.12 to 0.8.8

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	551/1000 Why? Recently disclosed, Has a fix available, CVSS 5.3	Denial of Service (DoS) SNYK-JS-JSZIP-1251497	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: xlsx

The new version differs by 17 commits.

• 7b6fb7b version bump 0.8.8: HTML
• d2b5506 parse rich strings with bare boolean tags
• 1b44629 Added 'var' to example to be strict mode compliant
• f113fb1 fixing an issue where _xd_ is getting escaped
• 3d1f0f7 version bump 0.8.7: bundlers
• 5ae6b19 version bump 0.8.6: module flush
• 7683e21 README fix [ci skip]
• 7408679 version bump 0.8.5: FODS/UOS and IE6+ support
• d7ecca0 version bump 0.8.4: formula parsing
• ab2eceb version bump 0.8.3: BIFF2 read/write
• 06670ae removing node 0.11 from travis
• 86d6a09 version bump 0.8.2: ODS and cleanup
• 2a756ff version bump 0.8.1: fixes to support node 4+
• 53f7f6d add missing comma in bower.json
• 704442c removing node 0.8 from test suite
• 0d38d4c version bump 0.8.0: unification with js-xls 0.7.5
• 61b17e6 handle internal links (fixes #145)

See the full diff

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