Bump the version to 3.0.0-preview.4

scripts/azure-pipelines-variables.yml

@@ -7,7 +7,7 @@ variables:
   GIT_BRANCH_NAME: $(Build.SourceBranch)
   GIT_URL: $(Build.Repository.Uri)
   FEATURE_NAME: ''
-  PREVIEW_LABEL: 'preview.0'
+  PREVIEW_LABEL: 'preview.4'
   BUILD_NUMBER: $[counter(format('_{0}_{1}_{2}__', variables['SKIASHARP_VERSION'], variables['Build.SourceBranch'], variables['PREVIEW_LABEL']), 1)]
   BUILD_COUNTER: $[counter('global_counter', 1)]
   TIZEN_LINUX_PACKAGES: libxcb-icccm4 libxcb-render-util0 gettext libxcb-image0 libsdl1.2debian libv4l-0 libxcb-randr0 bridge-utils libxcb-shape0 libpython2.7 openvpn libkf5itemmodels5 libkf5kiowidgets5 libkchart2