chore(greenkeeper): Update mocha to version 7.2.0.

Closes #78.

Author: greenkeeper[bot]

packages/@opticss/attr-analysis-dsl/package.json

@@ -51,7 +51,7 @@
     "@types/nearley": "^2.9.0",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
-    "mocha": "^6.1.4",
+    "mocha": "^7.2.0",
     "mocha-typescript": "^1.1.9",
     "remap-istanbul": "^0.13.0",
     "source-map-support": "^0.5.3",