Bump @types/chai from 4.2.14 to 4.2.15 (#1120)

Bumps [@types/chai](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/chai) from 4.2.14 to 4.2.15.
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package.json

@@ -86,7 +86,7 @@
     "@truffle/contract": "^4.3.6",
     "@typechain/truffle-v5": "^2.0.2",
     "@typechain/web3-v1": "^1.0.0",
-    "@types/chai": "^4.2.14",
+    "@types/chai": "^4.2.15",
     "@types/mocha": "^8.2.0",
     "@typescript-eslint/eslint-plugin": "^4.0.0",
     "@typescript-eslint/parser": "^3.10.1",

yarn.lock

@@ -858,10 +858,10 @@
   dependencies:
     "@types/node" "*"
 
-"@types/chai@^4.2.14":
-  version "4.2.14"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.14.tgz#44d2dd0b5de6185089375d976b4ec5caf6861193"
-  integrity sha512-G+ITQPXkwTrslfG5L/BksmbLUA0M1iybEsmCWPqzSxsRRhJZimBKJkoMi8fr/CPygPTj4zO5pJH7I2/cm9M7SQ==
+"@types/chai@^4.2.15":
+  version "4.2.15"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.15.tgz#b7a6d263c2cecf44b6de9a051cf496249b154553"
+  integrity sha512-rYff6FI+ZTKAPkJUoyz7Udq3GaoDZnxYDEvdEdFZASiA7PoErltHezDishqQiSDWrGxvxmplH304jyzQmjp0AQ==
 
 "@types/color-name@^1.1.1":
   version "1.1.1"