* fix(version): Displays supported APIs and version
Fixes#404
```
./kn version
Version: v20191017-local-6328a73-dirty
Build Date: 2019-10-17 09:55:55
Git Revision: 6328a73
Supported APIs:
- serving.knative.dev/v1alpha1 (knative-serving v0.8.0)
```
* Removes ServingVersion feeding from ldflags
- hardcodes the supported APIs as they're supposed to be updated when we bump deps
* Fixes typo in e2e tests
* Uses array for deterministic order of printing supported APIs
* Update serving to 0.8. Try building.
* Find the right serving version
* Change our own import path to knative.dev to match
* Remove dependency on old version of client
* Update yaml template
* Add sleep to test to deal with race
* fix merge conflict
* Update vendor modules
* chore: Streamlined build.sh
* Merged generate-docs.sh into build.sh
* Split up into smaller functions
* Added serving dependency version to 'kn version' command
Not sure whether the latter is really useful (showing the serving dependency)
as this is might get confused with the knative version
installed on the cluster.
* chore: Fixed indentation
Navid Shaikh