Rename coverage.sh to .coverage.sh (#270)

This is "infrastructure/meta" code, don't need to see it.

.coverage.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -e -x
+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