Update protoc-gen-grpc-gateway go get command

[seantcanavan]

go get github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway returns an error:

Tue Jan 26 10:03 PM ~: go get github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway
package github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway: cannot find package "github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway" in any of:
/usr/lib/go-1.13/src/github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway (from $GOROOT)
/home/userhome/go/src/github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway (from $GOPATH

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Brief description of what is fixed or changed

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[codecov-io]

Codecov Report

Merging #1929 (51a9090) into master (61fef09) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1929   +/-   ##
=======================================
  Coverage   57.96%   57.96%           
=======================================
  Files          34       34           
  Lines        3771     3771           
=======================================
  Hits         2186     2186           
  Misses       1311     1311           
  Partials      274      274           

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[johanbrandhorst]

Hi @seantcanavan, thanks for your contribution, unfortunately, this change is not an appropriate fix. The error you're seeing happens when trying to go get the grpc-gateway in GOPATH mode. The correct fix here is to set GO111MODULE=on, which will be the default in 1.16. Can you try the suggestion and confirm it fixes your issue? It works for me locally.

[johanbrandhorst]

Suggested change

	$ go get github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
	$ GO111MODULE=on go get github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway

[seantcanavan]

@johanbrandhorst thanks for the help! my project was using go modules but I didn't realize I had to set it globally. I'm using 1.13.8 which is the default for ubuntu 20 right now. I appreciate your patience with all this