v0.3.1

Hi all, happy friday.

I'm releasing this version just to clean the Unreleased section of the changelog and prepare everything for the v1 version. Changes for this release are:

• Trim titles when detecting hierarchical separators to avoid false negatives on strings with spaces.
• Fix issue when converting divs to p nodes and never rating them (issue #29)
• Fix "Unsupported operand types" (PR #31)
• Fix division by zero when no title was found (issue #32)
• New function to retrieve all images at once (PR #30)
• Get the title from the <title> tag before searching on the <meta> tags

Next release will be v1. For real this time.