chore(release): publish [skip ci]

- @ohif/extension-vtk@1.1.4
 - @ohif/core@2.1.1
 - @ohif/ui@1.1.4
 - @ohif/viewer@3.1.8

platform/viewer/CHANGELOG.md

@@ -3,6 +3,14 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+## [3.1.8](https://github.com/OHIF/Viewers/compare/@ohif/viewer@3.1.7...@ohif/viewer@3.1.8) (2019-12-16)
+
+**Note:** Version bump only for package @ohif/viewer
+
+
+
+
+
 ## [3.1.7](https://github.com/OHIF/Viewers/compare/@ohif/viewer@3.1.6...@ohif/viewer@3.1.7) (2019-12-13)
 
 **Note:** Version bump only for package @ohif/viewer