Integration Test failing due to new field in `get_info` (first_block_num)

**Version of EOSJS**
eosjs@edge against nodeos develop

**Describe the bug**
Types for get_info does not include `first_block_num` which was recently added.

**Expected behavior**
Test should pass.

**Additional context**
https://github.com/EOSIO/eosjs/runs/2283966802?check_suite_focus=true
