feat(wdbank.py): add world bank data interface

add world bank data interface form wbdata sdk

fix(fix test file): fix test file

fix test file

Merge branch 'master' of https://github.com/jindaxiang/akshare

Merge branch 'develop'

Merge branch 'develop'

Merge pull request akfamily#50 from jindaxiang/develop

feat(futures_sgx_daily): add futures_sgx_daily data from sgx

Merge branch 'master' of https://github.com/jindaxiang/akshare

Merge branch 'develop'

Merge branch 'master' of https://github.com/jindaxiang/akshare

Merge branch 'master' of https://github.com/jindaxiang/akshare