Remove should (#8196)

* remove should

* fix a few tests

package.json

@@ -94,7 +94,6 @@
     "@types/plotly.js": "^1.44.9",
     "@types/sanitize-html": "^1.18.2",
     "@types/semver": "^5.5.0",
-    "@types/should": "^13.0.0",
     "@types/sinon": "^1.16.36",
     "@types/webpack": "^4.4.10",
     "@types/winreg": "^1.2.30",
@@ -154,7 +153,6 @@
     "queue": "3.0.6",
     "rcedit": "^1.1.0",
     "rimraf": "^2.2.8",
-    "should": "^13.2.3",
     "sinon": "^1.17.2",
     "source-map": "^0.4.4",
     "temp-write": "^3.4.0",