build: bump ts-jest from 22.4.2 to 22.4.3

Bumps [ts-jest](https://github.com/kulshekhar/ts-jest) from 22.4.2 to 22.4.3.
- [Release notes](https://github.com/kulshekhar/ts-jest/releases)
- [Changelog](https://github.com/kulshekhar/ts-jest/blob/master/CHANGELOG.md)
- [Commits](kulshekhar/ts-jest@v22.4.2...v22.4.3)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -34,7 +34,7 @@
     "prettier": "^1.12.1",
     "replace-in-file": "^3.4.0",
     "ts-config": "^18.0.0",
-    "ts-jest": "^22.4.2",
+    "ts-jest": "^22.4.3",
     "tslint": "^5.9.1",
     "typedoc": "^0.11.1",
     "typescript": "^2.8.1"

yarn.lock

@@ -5029,9 +5029,9 @@ ts-config@^18.0.0:
   dependencies:
     comment-json "^1.1.3"
 
-ts-jest@^22.4.2:
-  version "22.4.2"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-22.4.2.tgz#2137bc0899b14dfb1d58257ee10b18ab8a2d92c5"
+ts-jest@^22.4.3:
+  version "22.4.3"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-22.4.3.tgz#5c06b89359e598d97f08802936ea400be555a9d1"
   dependencies:
     babel-core "^6.26.0"
     babel-plugin-istanbul "^4.1.4"