chore(package): update @fimbul/valtyr to version 0.8.0 (#65)

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "tsutils": "^2.24.0"
   },
   "devDependencies": {
-    "@fimbul/valtyr": "^0.7.0",
+    "@fimbul/valtyr": "^0.8.0",
     "@fimbul/wotan": "^0.8.0",
     "coveralls": "^3.0.0",
     "github-release-from-changelog": "^1.2.1",