Update deepcopy requirement from 0.6.3 to 2.0.0

Updates the requirements on deepcopy to permit the latest version.

Changelog

Sourced from deepcopy's changelog.

2.0.0 / 2019-02-15

• modernize

1.0.1 / 2019-02-01

• fixed #21

1.0.0 / 2018-05-21

• support some ES2015 types
• support ES Modules
• drop support for legacy environments

0.6.3 / 2016-06-13

• fixed #10, #11, #12

0.6.2 / 2016-06-12

• fixed #10

0.6.1 / 2016-01-13

• fixed #9

0.6.0 / 2015-12-29

• fixed #7
• added customizer argument

0.5.0 / 2015-04-11

• supported for Symbol

0.4.0 / 2015-01-10

• refactored
• bugfix for Firefox
• supported for Buffer (node.js only)
• changed to use power-assert from expect.js

0.3.3 / 2013-12-03

• bugfix
  • thanks to @​kjirou

0.3.2 / 2013-09-08

• more compressed deepcopy.min.js

... (truncated)

Commits

• c2b8803 updated version
• f34cb2f updated HISTORY.md
• 3d1eb5d updated indent within HISTORY.md
• 66280b0 updated README.md
• 1298e59 added renovate badge
• 8f28646 Merge pull request #49 from sasaplus1/renovate/lint-staged-8.x
• 2675406 Update dependency lint-staged to v8.1.4
• 6707703 Merge pull request #47 from sasaplus1/renovate/pin-dependencies
• 57a4153 Pin dependencies
• 408275e updated scripts
• Additional commits viewable in compare view

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