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.

1993/ant/README.md

@@ -12,7 +12,7 @@ Canada
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./ant 'ERE' [file ...]

1993/cmills/README.md

@@ -17,7 +17,7 @@ compile. macOS users running Mountain Lion and later will need to download and
 install [XQuartz](https://www.xquartz.org) in order to compile and run this
 entry.
 
-## To run:
+## To use:
 
 ```sh
 DISPLAY="your_X_server_display"\

1993/dgibson/README.md

@@ -13,7 +13,7 @@ South Africa
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./dgibson.sh [datafile]

1993/ejb/README.md

@@ -12,7 +12,7 @@ US
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./ejb level

1993/jonth/README.md

@@ -19,7 +19,7 @@ install [XQuartz](https://www.xquartz.org) in order to compile and run this
 entry.
 
 
-## To run:
+## To use:
 
 ```sh
 ./jonth			# must be run on an X11 server

1993/leo/README.md

@@ -14,7 +14,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 To have the computer guess:
 

1993/lmfjyh/README.md

@@ -30,7 +30,7 @@ There is an alternate version which simply does what the program did with gcc <
 2.3.3.
 
 
-## To run:
+## To use:
 
 If you have gcc < 2.3.3 (i.e. the entry can compile):
 

1993/plummer/README.md

@@ -13,7 +13,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./plummer number arg

1993/rince/README.md

@@ -13,7 +13,7 @@ make all
 NOTE: there is an alternate version of this program that allows one to slow down
 the game. See the Alternate code section below.
 
-## To run:
+## To use:
 
 ```sh
 ./rince [cabbage]

1993/schnitzi/README.md

@@ -14,7 +14,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./schnitzi file

1993/vanb/README.md

@@ -14,7 +14,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./vanb 'exp'