Minor spelling corrections

Corrected letter transpositions, and capitalized Alt+Tab for consistency (all other key names were at the beginning of their respective lines, so were already capitalized, but on my Surface Book all modifier keys and Tab are capitalized)

README.md

@@ -28,7 +28,7 @@ Here's the current set of utilities we're considering.  Please use issues and +1
 1. Full window manager including specific layouts for docking and undocking laptops
 2. Keyboard shortcut manager
 3. Win+R replacement
-4. Better alt+tab including browser tab integration and search for running apps
+4. Better Alt+Tab including browser tab integration and search for running apps
 5. Battery tracker
 6. Batch file re-namer
 6. Quick resolution swaps in taskbar