Fix message with report path

Description

Message with md report fixed.

Related issue

https://gitlab.com/postgres-ai-team/postgres-checkup/issues/347

Examples

[2019-03-19T15:01:51+0300] === Run on 'db2.xxxx.ru': ./resources/checks/H003_non_indexed_fks.sh ===
[2019-03-19T15:01:51+0300] === End of running ===
[2019-03-19T15:01:51+0300] JSON report saved at: './artifacts/postila/json_reports/20190311_2019_03_19T14_53_46_+0300/H003_non_indexed_fks.json'
[2019-03-19T15:01:51+0300] Markdown report saved at: './artifacts/postila/md_reports/20190311_2019_03_19T14_53_46_+0300/H003.md'
[2019-03-19T15:01:52+0300]
[2019-03-19T15:01:52+0300] === Run on 'db2.xxxx.ru': ./resources/checks/K000_query_analysis.sh ===
[2019-03-19T15:02:00+0300] === End of running ===
[2019-03-19T15:02:00+0300] JSON report saved at: './artifacts/postila/json_reports/20190311_2019_03_19T14_53_46_+0300/K000_query_analysis.json'
[2019-03-19T15:02:02+0300] Markdown report saved at: './artifacts/postila/md_reports/20190311_2019_03_19T14_53_46_+0300/K000.md'
[2019-03-19T15:02:02+0300]
[2019-03-19T15:02:02+0300] === Run on 'db2.xxxx.ru': ./resources/checks/L001_table_sizes.sh ===
[2019-03-19T15:02:02+0300] === End of running ===
[2019-03-19T15:02:02+0300] JSON report saved at: './artifacts/postila/json_reports/20190311_2019_03_19T14_53_46_+0300/L001_table_sizes.json'
[2019-03-19T15:02:02+0300] Markdown report saved at: './artifacts/postila/md_reports/20190311_2019_03_19T14_53_46_+0300/L001.md'
[2019-03-19T15:02:02+0300]
[2019-03-19T15:02:02+0300] === Run on 'db2.xxxx.ru': ./resources/checks/L003_integer_in_pk.sh ===
[2019-03-19T15:02:03+0300] === End of running ===
[2019-03-19T15:02:03+0300] JSON report saved at: './artifacts/postila/json_reports/20190311_2019_03_19T14_53_46_+0300/L003_integer_in_pk.json'
[2019-03-19T15:02:04+0300] Markdown report saved at: './artifacts/postila/md_reports/20190311_2019_03_19T14_53_46_+0300/L003.md'
[2019-03-19T15:02:04+0300]
[2019-03-19T15:02:04+0300] All checks has been finished for host 'db2.xxxx.ru'!