A GULP script to shift SPFx WebPart Id's by increasing the last character (e.g. 1 --> 2, 9 --> a, c --> d, f --> 0). The purpose is to use this as a part of an automated build/deployment (for example VSTS) in order to automatically create an alternative test package from all the web parts to be used in a development environment.
If you are using this you must also update the package name (for example from my-spfx-client-side-solution to my-spfx-client-side-solution-test) and change the id of the package during the build phase.