Release 3.0.1

• Merge remote-tracking branch 'origin/master' (5040f30)
• update readme (c12174e)
• Merge pull request #22 from torounit/fix/children-post-type-selector (b06a2b1)
• use tab indent for json (5e3d61d)
• child posts: fix post-type selector. (ae5e62d)
• update npm (a4baf69)
• Merge pull request #18 from torounit/dependabot/npm_and_yarn/ws-7.4.6 (760bf91)
• Merge pull request #19 from torounit/dependabot/npm_and_yarn/trim-newlines-3.0.1 (09c1a17)
• Bump trim-newlines from 3.0.0 to 3.0.1 (9c5ba9d)
• Bump ws from 7.4.5 to 7.4.6 (6a50cee)
• update npm packages (654198f)