Bump plugin to version 1.2.0

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Changelog

• Resolve block conflicts when editing a block post in the classic editor. Gutenberg's strict content validation has helped identify formatting incompatibilities, and continued improvements are planned for future releases.
• Add word and block count to table of contents.
• Add support for meta attributes (custom fields) in block attributes. This allows block authors to specify attributes to live outside of post_content entirely.
• Allow Gutenberg to be the default editor for posts with blocks and add links to classic editor.
• Accessibility: add landmark regions.
• Add metabox placeholder shell.
• Add crash recovery for blocks which error while saving.
• Hide Sidebar panels if the user doesn't have the right capabilities.
• Refactor PostTaxonomies to use 'withApiData'.
• Create 'withApiData' higher order component for managing API data.
• Make casing consistent.
• Allow toolbar wrapper to be clicked through.
• Support and bootstrap server-registered block attribute schemas.
• Shift focus into popover when opened.
• Reuse the tabbable utility to retrieve the tabbables elements in WritingFlow.
• Change placeholder text on button.
• Persist the sate of the sidebar across refresh.
• Use a small multiselect buffer zone, improving multiple block selection.
• Close popover by escape keypress.
• Improve dropzone contrast ratio.
• Improve search message to add context.
• Improve string extraction for localized strings.
• Fixed z-index issue of gallery image inline menu.
• Fixed image block resizing to set the figure wrapper.
• Fixed column widths in gallery block.
• Fixed parsing in do_blocks() and rendering of blocks on frontend in the_content.
• Fixed position of upload svg on mobile.