chore(package): update eslint-plugin-jest to version 21.26.0

Closes #215

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "dont-break": "1.13.4",
     "eslint": "4.19.1",
     "eslint-plugin-import": "2.12.0",
-    "eslint-plugin-jest": "21.17.0",
+    "eslint-plugin-jest": "21.26.0",
     "eslint-plugin-node": "6.0.1",
     "expect.js": "0.3.1",
     "greenkeeper-lockfile": "1.15.1",