auto crop images; optional placeholder info

• chore(doc): add new functions to readme d645480
• Merge pull request #184 from kirkeskov/feat/image-with-cover-prop b45082e
• fix(shape): uses getPlaceholderInfo() only if needed, maybe related to #183 fe40b97
• feat(image): Added support for adding image that auto crops and covers on replacement 66d0419

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v0.8.0...v0.8.1