Update README.md

Author: nealhaddaway

README.md

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-# PRISMA2020 Flow Chart <img src="PRISMA2020-hex.png" align="right" width="20%"/>
+# PRISMA2020 Flow Chart <img src="PRISMA2020-hex.png" align="right" width="15%"/>
 
 You can use this package to produce a flow chart that conforms to the PRISMA 2020 preprint standards using the `PRISMA_flowchart()` function. The data can be manually entered into the function, or loaded up using the template CSV file provided in 'INST/EXTDATA/'. The function, (if 'interactive = TRUE') produces an interactive HTML ouput with each box linking to a specific page (e.g. of search results or methods details), and hover-over tooltips for further information. 
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+<br>
 <img src="inst/extdata/PRISMA.png" align="right" width="60%" height="40%" />
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+<br>
 The 'Previous' and 'Other' study arms of the flowchart can be toggled on and off and removed or added to the chart by specifying this in the function inputs.
 
 A static version is produced otherwise. <a href="https://srflowdiagram.github.io/template.html" target="_blank">