chore(greenkeeper): Update @types/mocha to version 7.0.2.

Closes #79.

Author: greenkeeper[bot]

packages/@opticss/element-analysis/package.json

@@ -43,7 +43,7 @@
   "devDependencies": {
     "@opticss/code-style": "^0.6.0",
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.2",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
     "mocha": "^6.1.4",