Release 0.1.0-alpha.3

• test: add list-dirs and list-tags unit test 8d05a96
• feat: pass dir and options to getTags func 8c154fb
• fix: md tags cache file should save the working root directory b22df3d
• feat: extract simple-slug func d154d61
• feat: extract saveTagsTo func 6de20d6
• fix: more special chars filter for filename 8411b3a
• feat: add debug module 8b41bf7
• fix: only save tags after listTags a54a625
• chore: remove debug print 11ab4dd
• feat(command): list-dirs ignore the dir name is dirname.html d34ee66
• docs: update README a3b821c
• feat(command): upate the new saveTags usage on tags command 449b033
• chore(test): add jest root dir 9105701
• chore: remove unused file: .md-tags.yaml 2660ad5
• chore: add ignore words 6fec77e