Bump syn from 1.0.14 to 1.0.16

[dependabot-preview]

Bumps syn from 1.0.14 to 1.0.16.

Release notes

Sourced from syn's releases.

1.0.16

• Fix parsing of &raw raw reference operator (rust-lang/rust#64490) to require explicitly specified constness, &raw mut or &raw const

1.0.15

• Add Punctuated::first_mut to return a mut reference to the first sequence element

Commits

• b76945a Release 1.0.16
• fc9b10e Merge pull request #774 from dtolnay/raw
• d7ccd42 Fix raw operator parsing to require const keyword
• 76134b7 Update test suite to nightly-2020-02-24
• d4fc613 Release 1.0.15
• e6cf1dd Add syntax issue links
• dd8a4db Categorize newly added syntax
• a79b074 Update rust repo revision to nightly-2020-02-21
• 91c662a Strip common prefix from paths in test path filter
• 86c35d9 Merge pull request #757 from dtolnay/first_mut
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

If all status checks pass Dependabot will automatically merge this pull request.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

[dependabot-preview]

One of your CI runs failed on this pull request, so Dependabot won't merge it.

• latex-lsp.texlab

Dependabot will still automatically merge this pull request if you amend it and your tests pass.