release needs to be semantic

Signed-off-by: Christian Kreuzberger <christian.kreuzberger@dynatrace.com>

Merge pull request keptn#153 from keptn/release-0.8.0.alpha

Release notes for 0.8.0.alpha

Update of Readme for 0.7.3

Fixed version

Merge pull request keptn#130 from keptn/patch/prepare-0.7.1

Set version to 0.7.1

Merge pull request keptn#121 from keptn/patch/fix-selector

Fix selector

Merge pull request keptn#98 from keptn/patch/fix-faulty-loadgen

Patch/fix faulty loadgen

Merge pull request keptn#90 from keptn/patch/1497/default-values

#1495 Added filter and weight properties to SLOs

Merge pull request keptn#78 from keptn/patch/update-readme

Update readme for release 0.6.0

Merge pull request keptn#66 from keptn/patch/spec-update

updated reference to spec version