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.

2015/burton/README.md

@@ -9,7 +9,7 @@
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog "expression"

2015/dogon/README.md

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

2015/duble/README.md

@@ -9,7 +9,7 @@
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 echo Some text | ./prog

2015/endoh1/README.md

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

2015/endoh2/README.md

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

2015/endoh3/README.md

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

2015/endoh4/README.md

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

2015/hou/README.md

@@ -9,7 +9,7 @@
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 echo IOCCC | ./prog

2015/howe/README.md

@@ -10,7 +10,7 @@ Montreal, Quebec, Canada\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog file1 file2

2015/mills1/README.md

@@ -8,7 +8,7 @@ Chris Mills
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog

2015/mills2/README.md

@@ -8,7 +8,7 @@
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./prog compressed_file.Z

2015/muth/README.md

@@ -9,7 +9,7 @@
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 make -B [MACHINE=your_machine.h] [TAPE=your_tape.h] [X=[0|1|2|3|4|5|6|7|8|9]] [V=[0|1|2]] run

2015/schweikhardt/README.md

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

2015/yang/README.md

@@ -11,7 +11,7 @@ make
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 echo Some text | ./prog\