Update README.md

README.md

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 >` magic -T ../libs/sky130A.tech BGR.mag`
 <p>&nbsp;</p>
 
-![Layout](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/photo/Layout.png)
+![Layout](https://raw.githubusercontent.com/vsdip/avsdbgp_3v3_sky130_v2/main/photo/layout.png)
 <p>&nbsp;</p>
 
 # Post-Layout Simulation plots of Bandgap Reference IP circuit