[CAM-13258] Add support for Camunda BPM 7.15 in BPM Assert

Before running the release job:
- adjust parent version in examples and its submodules to the release version (without SNAPHOT) to create a proper release source ZIP
- adjust version to release version (without SNAPSHOT) in the README
- (optional) adjust the Travis environments in the .travis.yml to the latest Camunda versions, if the release is due to a new Camunda version
Done with the release job:
- bump Camunda version in pom.xml
After running the release job:
- adjust the parent version to the next SNAPSHOT in the examples and its submodules
- adjust compatibility matrix
- adjust Assert version in https://docs.camunda.org/manual/develop/user-guide/testing/#camunda-assertions

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