Bump chartkick from 3.1.1 to 3.2.1

[dependabot[bot]]

Bumps chartkick from 3.1.1 to 3.2.1.

Changelog

Sourced from chartkick's changelog.

3.2.1 (2020-07-23)

• Added support for petabytes and exabytes
• Fixed error with xmin and xmax and empty data
• Fixed error with GeoChart with latest Google Charts release

3.2.0 (2019-11-09)

• Fixed prototype pollution - see #117
• Added bytes option for Chart.js
• Added precision option
• Added round option
• Added zeros option

3.1.3 (2019-10-27)

• Removed Error Loading Chart prefix for callback errors

3.1.2 (2019-10-27)

• Added support for callbacks as data
• Fixed stacked option for Highcharts area charts
• Fixed error with jQuery slim
• Fixed deprecation warning with Chart.js 2.9.0+

Commits

• 133ace5 Version bump to 3.2.1 [skip ci]
• 4721d62 Fixed error with GeoChart with latest Google Charts release
• 01d23b6 Use npm instead of yarn in docs [skip ci]
• 17ffb5c Use npm instead of yarn in docs [skip ci]
• fa5da46 Use npm install in docs [skip ci]
• 945c9ed Updated plugins
• 7e9e3d9 Test empty scatter
• e76e208 Fixed error with xmin and xmax and empty data - fixes #118
• b32c51d Updated Chart.js to 2.9.3
• 49c14a4 Added missing changelog date [skip ci]
• Additional commits viewable in compare view

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