Update chart.js to version 2.1.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

chart.js just published its new version 2.1.1, 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 chart.js – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

---

GitHub Release

This release only contains bug fixes.

Issues Fixed

• Remove all comments from minified build #2462. Thanks to @zachpanz88
• Fix an issue with custom tooltips not rendering #2384 Thanks to @brizido
• Minified file size reduction of 2KB #2463
• Updated legend documentation to better indicate what is passed to generateLabels
• Fix an issue with line tensions not working #2467
• Fix an issue in the time scale where grid lines were not drawn at the correct spot #2471

---

The new version differs by 1467 commits .

• 29ab84c Merge pull request #2484 from chartjs/release/2.1.1
• 8fb2073 2.1.1 release build
• f3363e1 Merge pull request #2475 from chartjs/fix/2471
• 8d88e9c Fix time scale grid lines
• b2dc292 Merge pull request #2473 from chartjs/fix/tension
• c4bff16 Fix line tension drawing, especially when set to 0
• c079d73 Merge pull request #2468 from dmk2014/master
• ad9f40f Update legend docs -> parameter 'data' has changed to 'chart'.
• 7eb4731 Merge pull request #2463 from chartjs/file-size-reduction
• 8f6f882 Fix jshint issue
• 4258137 Size reduction for elements
• 3c33cdf core dataset controller update
• 4068836 Reduce core.title.js size
• 5ca07b8 Minor legend fix when going to next line
• 7de70c2 Plugin system is slightly smaller

There are 250 commits in total. See the full diff.

---

This pull request was created by greenkeeper.io. It keeps your software up to date, all the time.

_{Tired of seeing this sponsor message? Upgrade to the supporter plan! You'll also get your pull requests faster :zap:}