Get Slack token from file instead of environment variable #72
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Following Kubernetes security best practice (https://www.tenable.com/audits/items/CIS_Kubernetes_v1.6.1_Level_2_Master.audit:98de3da69271994afb6211cf86ae4c6b), try to get Slack token from file first, only when the file name is not set, fall back to load token from environment variable directly. Also added unit tests and updated doc.
Closes #71.