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.

1993/lmfjyh/README.md

@@ -39,7 +39,7 @@ If you have gcc < 2.3.3 (i.e. the entry can compile):
 ```
 
 
-### Alternate code:
+## Alternate code:
 
 To use:
 

1993/plummer/README.md

@@ -34,7 +34,7 @@ NOTE: an alternate version exists. See Alternate code section below.
 
 ```
 
-### Alternate code:
+## Alternate code:
 
 To use:
 

1993/rince/README.md

@@ -23,7 +23,7 @@ where:
 
 `[cabbage]` is a CABBAGE description file  (default: `rince.c`)
 
-### Alternate code: slowing down the game
+## Alternate code: slowing down the game
 
 Some people may want to slow down the game by increasing the
 value 17 in the lines: