update code coverage script

scripts/generate-coverage.sh

@@ -1,15 +1,8 @@
 #!/bin/bash
 
-# source: https://github.com/codecov/example-go
-# go test can't generate code coverage for multiple packages in one command
+set -o errexit
+set -o nounset
+set -o pipefail
 
- set -e
-touch coverage.out
-go test -i -race ./cmd/terrascan
-for d in $(go list ./... | grep -v vendor | grep -v tests | grep -v integration_test); do
-    go test -race -coverprofile=profile.out -covermode=atomic $d
-    if [ -f profile.out ]; then
-        cat profile.out >> coverage.out
-        rm profile.out
-    fi
-done
+go test -v -coverpkg=./... -coverprofile=coverage.out ./...
+go tool cover -func coverage.out