Update Dash to 1.* and React to 16.13

[xhluca]

• requirements.txt: dash==0.38.0 -> dash[dev]==1.*
• tests/requirements.txt: dash==0.38.0 -> dash[dev, testing]==1.*
• package.json: react@15 -> react@16.13.0

About

Description of changes

Pre-Merge checklist

• The project was correctly built with npm run build:all.
• If there was any conflict, it was solved correctly.
• All changes were documented in CHANGELOG.md.
• All tests on CircleCI have passed.
• All Percy visual changes have been approved.
• Two people have 💃'd the pull request. You can be one of these people if you are a Dash Cytoscape core contributor.

Reference Issues

Closes #[issue number]

Other comments

[xhluca]

Let's get #117 merged instead (this one is redundant)