chore(deps): update dependency @types/chai to v4.2.0

Author: renovate-bot

package.json

@@ -42,7 +42,7 @@
     "@sourcegraph/prettierrc": "^3.0.1",
     "@sourcegraph/tsconfig": "^4.0.0",
     "@sourcegraph/tslint-config": "^13.4.0",
-    "@types/chai": "4.1.7",
+    "@types/chai": "4.2.0",
     "@types/fs-extra": "7.0.0",
     "@types/karma": "3.0.3",
     "@types/karma-webpack": "2.0.7",

yarn.lock

@@ -420,10 +420,10 @@
   resolved "https://registry.yarnpkg.com/@types/bluebird/-/bluebird-3.5.24.tgz#11f76812531c14f793b8ecbf1de96f672905de8a"
   integrity sha512-YeQoDpq4Lm8ppSBqAnAeF/xy1cYp/dMTif2JFcvmAbETMRlvKHT2iLcWu+WyYiJO3b3Ivokwo7EQca/xfLVJmg==
 
-"@types/chai@4.1.7":
-  version "4.1.7"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.1.7.tgz#1b8e33b61a8c09cbe1f85133071baa0dbf9fa71a"
-  integrity sha512-2Y8uPt0/jwjhQ6EiluT0XCri1Dbplr0ZxfFXUz+ye13gaqE8u5gL5ppao1JrUYr9cIip5S6MvQzBS7Kke7U9VA==
+"@types/chai@4.2.0":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.0.tgz#2478260021408dec32c123a7cad3414beb811a07"
+  integrity sha512-zw8UvoBEImn392tLjxoavuonblX/4Yb9ha4KBU10FirCfwgzhKO0dvyJSF9ByxV1xK1r2AgnAi/tvQaLgxQqxA==
 
 "@types/connect@*":
   version "3.4.32"