v0.5.0

Changelog

1965bb5 update readme
85341d4 Merge pull request #16 from bojand/pretty_json
e29ac01 Merge branch 'master' into pretty_json
16d9ebc Merge pull request #15 from bojand/duration_fix
2b96b8f Fix -z duration option and add -x duration option
c740cb9 add prety_json support. add json formatting. update test cert and key

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