fix a few more standard header lines in winner README.md files

2018/anderson/README.md

@@ -25,6 +25,7 @@ make
 ./prog < README.md
 ```
 
+
 ## Alternate code:
 
 An alternate version of this entry, [prog.alt.c](prog.alt.c), is provided.

2018/burton1/README.md

@@ -25,6 +25,7 @@ make
 ./prog < prog.c
 ```
 
+
 ## Alternate code:
 
 An alternate version of this entry, [prog.alt.c](prog.alt.c), is provided

2018/ciura/README.md

@@ -24,6 +24,7 @@ make
 ./prog < README.md
 ```
 
+
 ## Alternate code:
 
 An alternate version of this entry, `prog.alt.c`, is provided.  As mentioned in

2018/ferguson/README.md

@@ -31,6 +31,7 @@ make
 make test
 ```
 
+
 ## Alternate code:
 
 The author provided an alternate version which has a simpler keyboard for the