Merge pull request #104 from tamaynard/bump-vtk-26.8.0

feat(vtk.js): update vtk.js to 26.8.0

Author: floryst

package.json

@@ -42,7 +42,7 @@
     "dev": "rollup ./src/index.js -c --watch"
   },
   "peerDependencies": {
-    "@kitware/vtk.js": "^26.5.3",
+    "@kitware/vtk.js": "^26.8.0",
     "react": "^16.0.0"
   },
   "devDependencies": {