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

Closes #7

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "progress-bar-webpack-plugin": "^2.1.0",
     "qiniu": "^7.3.0",
     "sass-loader": "^8.0.2",
-    "ts-jest": "^25.2.0",
+    "ts-jest": "^26.1.0",
     "ts-loader": "^6.2.1",
     "typescript": "^3.7.5",
     "url-loader": "^3.0.0",