fix await

[shunjizhan]

this should fix #1055

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.06%. Comparing base (bb331d6) to head (516a4cc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1056   +/-   ##
=======================================
  Coverage   78.06%   78.06%           
=======================================
  Files          55       55           
  Lines        2722     2722           
  Branches      617      633   +16     
=======================================
  Hits         2125     2125           
  Misses        584      584           
  Partials       13       13           

Files with missing lines	Coverage Δ
packages/eth-providers/src/base-provider.ts	83.63% <100.00%> (ø)