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.

1988/litmaath/README.md

@@ -24,7 +24,7 @@ code](#alternate-code) section below.
 ./litmaath eschew obfuscation
 ```
 
-### Alternate code:
+## Alternate code:
 
 
 This alternate code, added to help understand the entry and for fun, is code