Change 'To run' to 'To use' in all README.md files

As in:

    sgit -e 's/# To run/# To use/g' '*README.md'

This makes consistent the message for how to use the program. 'How to
use' was chosen because one can run a program just by doing './foo' but
that doesn't imply that's how to use it but the purpose of the section
is how to use it.

2018/algmyr/README.md

@@ -8,7 +8,7 @@ Anton Älgmyr
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 cat prog.c | ./prog           # Printing garbage might break your font

2018/anderson/README.md

@@ -8,7 +8,7 @@ Derek Anderson
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog < textfile

2018/bellard/README.md

@@ -9,7 +9,7 @@ Fabrice Bellard\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog > lena.ppm

2018/burton1/README.md

@@ -9,7 +9,7 @@
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog < any-file

2018/burton2/README.md

@@ -9,7 +9,7 @@ Dave Burton\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog [-tcksri] < file.c

2018/ciura/README.md

@@ -8,7 +8,7 @@ Marcin Ciura <mciura@gmail.com>
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog < text

2018/endoh1/README.md

@@ -10,7 +10,7 @@ Mastodon: [@mame@ruby.social](https://ruby.social/@mame)
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog < textfile > output.gif

2018/endoh2/README.md

@@ -10,7 +10,7 @@ Mastodon: [@mame@ruby.social](https://ruby.social/@mame)
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog

2018/ferguson/README.md

@@ -11,7 +11,7 @@ Mastodon: [@xexyl@fosstodon.org](https://fosstodon.org/@xexyl)
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./weasel

2018/giles/README.md

@@ -82,7 +82,7 @@ Makefiles.
 See also the judges' remarks below.
 
 
-## To run:
+## To use:
 
 ```sh
 ./prog

2018/hou/README.md

@@ -8,7 +8,7 @@ Qiming Hou
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog < input.json > output.html

2018/mills/README.md

@@ -8,7 +8,7 @@ Christopher Mills <mrxo@sonic.net>
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog

2018/poikola/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./prog

2018/vokes/README.md

@@ -8,7 +8,7 @@ Scott Vokes
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog < example-1.txt

2018/yang/README.md

@@ -9,7 +9,7 @@
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 more generated1.c