chore(package): update ts-jest to version 26.1.0

Closes #45

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "react-dom": "^16.8.6",
     "react-test-renderer": "^16.8.6",
     "react-testing-library": "^8.0.0",
-    "ts-jest": "^24.0.0",
+    "ts-jest": "^26.1.0",
     "typescript": "^3.4.5"
   },
   "files": [