Merge release tasks into one

README.md

@@ -186,7 +186,7 @@ def destroy(project):
 pyb dev publish upload
 pip3 install --upgrade ddadevops --pre
 
-pyb [patch|minor|major] prepare_release tag_bump_and_push_release
+pyb [patch|minor|major] release
 pip3 install --upgrade ddadevops
 ```
 

build.py

@@ -130,16 +130,11 @@ def nothing(project):
     pass
 
 @task
-def prepare_release(project):
+def release(project):
     build = get_devops_build(project)
     build.prepare_release()
-
-@task
-def tag_bump_and_push_release(project):
-    build = get_devops_build(project)
     build.tag_bump_and_push_release()
 
-
 def build(project, release_type):
     build = get_devops_build(project)
     build.update_release_type(release_type)