Updated Roadmap (markdown)

Roadmap.md

@@ -10,6 +10,9 @@
 * Alternate interleaved multi-sweeping
 * Live, interleaved sweeps
 * Admittance, Conductance/Susceptance readouts for markers
+* Rescan button for serial ports
+* Complete dark mode skin
+* Linear/logarithmic frequency display in graphs
 
 ## 0.0.11
 * Averaging of multiple readings