chore: update april zh imports

Author: wackerow

public/content/translations/zh/developers/tutorials/how-to-mock-solidity-contracts-for-testing/index.md

@@ -9,7 +9,7 @@ tags:
   - "测试"
   - "模拟"
 skill: intermediate
-published: 2020-05-02
+published: 2020年05月02日
 source: soliditydeveloper.com
 sourceUrl: https://soliditydeveloper.com/mocking-contracts
 ---