Change github.com/golang/protobuf (deprecated) to google.golang.org/protobuf

Author: ebroberson

scripts/generate_protos.sh

@@ -1,7 +1,7 @@
 set -e
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 pushd "$DIR/../models"
-protoc --proto_path=../../vendor:../../vendor/github.com/golang/protobuf/ptypes/duration/:. \
+protoc --proto_path=../../vendor:../../vendor/google.golang.org/protobuf/types/known/durationpb/:. \
     --go_out=. --go_opt=paths=source_relative \
     --go-grpc_out=. --go-grpc_opt=paths=source_relative \
     ./*.proto