Changing heading level of 'Alternate code'

Change level 3 (###) to level 2 (##):

    sgit -e 's/^### \(Alternate code\)/## \1/g' '*README.md'

which is the same as:

    sgit -e 's/^### Alternate code/## Alternate code/g' '*README.md'

This is per discussion in GitHub.

2012/vik/README.md

@@ -67,7 +67,7 @@ fire](https://en.wikipedia.org/wiki/Halt_and_Catch_Fire_(computing)) :-)
 ```
 
 
-### Alternate code:
+## Alternate code:
 
 For those few who might use Windows, To compile: