Ipycytoscape

What's Changed
* Add acknowledgements and uniformize copyright headers by SylvainCorlay in https://github.com/cytoscape/ipycytoscape/pull/263
* Updating links to reflect org change by marimeireles in https://github.com/cytoscape/ipycytoscape/pull/264
* Fix nbclassic=0.2.8 version by marimeireles in https://github.com/cytoscape/ipycytoscape/pull/266
* Update Readme to reflect changes on py2neo support by marimeireles in https://github.com/cytoscape/ipycytoscape/pull/265
* Update README.md by marimeireles in https://github.com/cytoscape/ipycytoscape/pull/267
* Adds new generic ipycytoscape example by marimeireles in https://github.com/cytoscape/ipycytoscape/pull/271
* fix quoting in test setup command by dreness in https://github.com/cytoscape/ipycytoscape/pull/279
* add constructor to main widget by vaniisgh in https://github.com/cytoscape/ipycytoscape/pull/258
* Doc improvments by ianhi in https://github.com/cytoscape/ipycytoscape/pull/284
* Optional import improvements by ianhi in https://github.com/cytoscape/ipycytoscape/pull/285
* Version Bump + Update release scripts + Trove classifiers by ianhi in https://github.com/cytoscape/ipycytoscape/pull/287

New Contributors
* dreness made their first contribution in https://github.com/cytoscape/ipycytoscape/pull/279
* vaniisgh made their first contribution in https://github.com/cytoscape/ipycytoscape/pull/258

**Full Changelog**: https://github.com/cytoscape/ipycytoscape/compare/1.2.2...1.3.0

Now `ipycytoscape` will work with JuptyerLab 3 and no longer requires a build step or nodejs.

Thanks to all the contributors for this release:
- new examples - joseberlines
- Consolidated code for adding nodes and edges - sven5s
- Update to work with JupyterLab3 - martinRenou
- Restore lazy loading of js - bollwyvl