add codecov.io

scripts/generate-coverage.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# source: https://github.com/codecov/example-go
+# go test can't generate code coverage for multiple packages in one command
+
+set -e
+echo "" > coverage.txt
+
+for d in $(go list ./... | grep -v vendor); do
+    go test -race -coverprofile=profile.out -covermode=atomic $d
+    if [ -f profile.out ]; then
+        cat profile.out >> coverage.txt
+        rm profile.out
+    fi
+done