added changelog
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 [A circuit for all Seasons - B. Razavi](
+# Changes from MPW6
+- Connection to caravel wrapper on top-level
+- Increased metal widths and vias.
+- Improved regulator layout. 
+- Improved bandgap amplifier performance.
+- Updated verilog of SAR, to keep valid pin in a high state after single shot conversion.
+- Adressed potential antenna issue in DAC connection.
+- Overall layout cleanup.
+- Added sx-cut to allow for seperate ground extraction.