Make updating this repo part of each 3D-e-Chem KNIME node release

[sverhoeven]

Add tldr; Add or update plugin chapter to README of this repo:

6. Update single feature update site (https://github.com/3D-e-Chem/knime-node-collection)
  1. Clone or pull https://github.com/3D-e-Chem/knime-node-collection repo
  2. Change directory to knime-node-collection repo
  3. Make sure plugin and it's 3D-e-Chem dependencies are mentioned in `feature/feature.xml` file
  4. Bump version of knime-node-collection repo with `mvn org.eclipse.tycho:tycho-versions-plugin:set-version -DnewVersion=<version>`
  5. Populate update site with `mvn install`
  6. Add new files to commit
  7. Commit and push

To each plugin repo add to release steps:

6. Update single feature update site see instructions at https://github.com/3D-e-Chem/knime-node-collection#releasing-a-new-version-of-a-knime-node

Repos:

• [x] tycho-knime-node-archetype
• [x] knime-python-node-archetype
• [x] knime-testflow
• [x] knime-python-wrapper
• [x] knime-3d-e-chem
• [x] knime-modified-tanimoto
• [x] knime-gpcrdb
• [x] knime-kripodb
• [x] knime-sstea
• [x] knime-klifs
• [x] knime-sygma
• [x] knime-molviewer
• [x] knime-plants
• [x] knime-spores

[sverhoeven]

Simplified step for each plugin repo to

6. Make nodes available to 3D-e-Chem KNIME feature by following steps at https://github.com/3D-e-Chem/knime-node-collection#new-release

[sverhoeven]

Added step to new release chapter of each KNIME node repo.