Changed to be able to notify slack

[keitakn]

Summary

Added processing so that you can notify logs to Slack.

IssueURL

#47

[coveralls]

Pull Request Test Coverage Report for Build 90

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 88:	0.0%
Covered Lines:	130
Relevant Lines:	130

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 96

• 63 of 63 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 88:	0.0%
Covered Lines:	192
Relevant Lines:	192

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💛 - Coveralls

[keitakn]

Memo

• should be able to set Slack's access token
• The access token used in the test code should be encrypted