Update codemirror to the latest version 🚀

[greenkeeper]

Version 5.31.0 of codemirror was just published.

Dependency	codemirror
Current Version	5.30.0
Type	dependency

The version 5.31.0 is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

It might be worth looking into these changes and trying to get this project onto the latest version of codemirror.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.

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Commits

The new version differs by 43 commits.

• f936d89 Mark version 5.31.0
• a7f6e9f Fix baseToken to actually return the token ahead when on boundary
• 40a8182 Fix baseToken method
• cf79995 [bin/authors.sh] Make sure changed name doesn't resurface from git history
• d323ad7 (Update my name)
• d14888a [javascript mode] Fix bug in object literal spread parsing
• 42a2632 [sql mode] Fix representation of table hinting in demo page
• 79d266e Add a baseToken method to string streams
• deaa842 [runmode addon] Include CodeMirror.innerMode in runmode.node.js
• e5e2aef [closebrackets addon] Use editor line separator when exploding lines
• c1196eb [sublime keymap] Fix fallthrough for mac bindings
• 1951460 [sublime bindings] Export macSublime & pcSublime keymaps
• 43d0324 [continuecomment addon] Fix issue with single-line block comments
• ad6635a [vim bindings] Show fat cursor even in contentEditable mode
• a073d18 Remove mode-mutating kludge in continuecomment

There are 43 commits in total.

See the full diff

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This change is 

[coveralls]

Coverage remained the same at 91.768% when pulling 64d0b27 on greenkeeper/codemirror-5.31.0 into 0015f05 on master.