Merge pull request gcpug#36 from gcpug/fix-circleci-go1.14.4

Update Go image of CircleCI to go1.14.4

Merge pull request gcpug#31 from gcpug/fix-ignore

Fix ignore comment bug

Merge pull request gcpug#28 from gcpug/fix-fallback-path

Remove default case for unexpected types

Merge pull request gcpug#24 from gcpug/fix-stackoverflow

Fix stack overflow

Merge pull request gcpug#21 from gcpug/fix-grpcstatus

Fix for GRPCStatus

Merge pull request gcpug#19 from gcpug/add-wraperr

Add wraperr

Merge pull request gcpug#18 from gcpug/add-unclosetx-test

Add test

Remove old sample code

Fix README