fix(deps): update dependency mathjs to v6 (#399)

renovate[bot] · callmehiphop · commit 6c371962b2d3 · 2019-06-11T08:47:47.000-07:00
diff --git a/samples/package.json b/samples/package.json
@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@google-cloud/vision": "^1.1.0",
-    "mathjs": "^5.0.4",
+    "mathjs": "^6.0.0",
     "natural": "^0.6.1",
     "redis": "^2.8.0",
     "yargs": "^13.0.0",
