Update pica requirement from ^4.0.1 to ^5.0.0

[dependabot-preview]

Updates the requirements on pica to permit the latest version.

Changelog

Sourced from pica's changelog.

5.0.0 / 2018-11-02

• Maintenance, babelify upgrade: switch to @babel/core and @babel/preset-env.

4.2.0 / 2018-10-25

• Added bounds check for invalid output canvas size (#155).
• Maintenance: dev deps bump.

4.1.1 / 2018-03-31

• Should return result via promise (regression), fix #139.

4.1.0 / 2018-03-27

• Resize in multiple steps for big scales, fix #135.

4.0.2 / 2018-03-05

• Multimath bump, should fix issue with broken WebAssembly engine in IOS 11.2.x
  Webkit (Safary/Chrome).

4.0.1 / 2017-10-13

• Attempt to fix failure when WebAssembly disabled via CSP.

4.0.0 / 2017-09-30

• Internals rewritten to use multimath library.
• WebAssembly implementation for unsharp mask, as bonus.

3.0.6 / 2017-07-13

• More constrains for createImageBitmap() use. Filter out browsers
  without ImageBitmap.prototype.close() method (Chrome 51 etc).

... (truncated)

Commits

• See full diff in compare view

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[coveralls]

Coverage remained the same at 27.887% when pulling 2900bb4 on dependabot/npm_and_yarn/pica-tw-5.0.0 into 79334d6 on master.

[dependabot-preview]

Superseded by #85.