Update codemirror to version 5.15.0 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

codemirror just published its new version 5.15.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of codemirror – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 189 commits .

• 2884420 Mark release 5.15.0
• 5473c7a Remove debug statement
• b27701c [sql-hint addon] Don't reuse global keywords variable
• 8c00b06 [javascript mode] Improve parsing of TypeScript types
• eb3eab7 [simplescrollbars addon] Make sure thumb position is updated when size changes
• 59c4ebd [clike mode] Allow underscores in Java numbers
• 20d981f Fix patch 28abd453ff7
• 28abd45 Only read lastCopied.lineWise when lastCopied matches clipboard
• b2c1116 [javascript mode] Support async and await
• 889098f Tie lastCopied and lastCopiedLineWise into single value
• 9812173 Paste linewise-copied content at beginning of line
• 65eee1b Bind Ctrl-O to openLine on OS X
• ea28094 Fixed redeclared variables to avoid compiler warnings.
• 55a47a5 Revert "[sublime keymap] Add sublime-style smart backspace"
• 5067bae [vim mode] Fix fat-cursor border

There are 189 commits in total. See the full diff.

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