Add to Internet history about UUCP

In the years 1991, 1992, 1993, 1994 and 1995 the README.md/index.html
files referred to the UUCP for mail with the text:

    For those who appreciate a bit of Internet history, this is how
    people used to contact the IOCCC in this given year

and I added to it the text:

    via Unix to Unix CoPy (UUCP)

where 'Unix to Unix CoPy (UUCP)' is a link to 'complete' the history.

1991/README.md

@@ -76,7 +76,8 @@ See [How to contact the IOCCC](../contact.html) for how to provide
 us with your comments and suggestions today.
 
 For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:
+people used to contact the IOCCC in this given year, via [Unix to Unix CoPy
+(UUCP)](https://en.wikipedia.org/wiki/UUCP#Mail_routing):
 
 >   ...!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 >   judges@toad.com

1991/index.html

@@ -455,7 +455,8 @@ Also include anything else that you would like to see in future contests.
 See <a href="../contact.html">How to contact the IOCCC</a> for how to provide
 us with your comments and suggestions today.</p>
 <p>For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:</p>
+people used to contact the IOCCC in this given year, via <a href="https://en.wikipedia.org/wiki/UUCP#Mail_routing">Unix to Unix CoPy
+(UUCP)</a>:</p>
 <blockquote>
 <p>…!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 judges@toad.com</p>

1992/README.md

@@ -66,7 +66,8 @@ See [How to contact the IOCCC](../contact.html) for how to provide
 us with your comments and suggestions today.
 
 For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:
+people used to contact the IOCCC in this given year, via [Unix to Unix CoPy
+(UUCP)](https://en.wikipedia.org/wiki/UUCP#Mail_routing):
 
 >   ...!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 >   judges@toad.com

1992/index.html

@@ -445,7 +445,8 @@ Also include anything else that you would like to see in future contests.
 See <a href="../contact.html">How to contact the IOCCC</a> for how to provide
 us with your comments and suggestions today.</p>
 <p>For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:</p>
+people used to contact the IOCCC in this given year, via <a href="https://en.wikipedia.org/wiki/UUCP#Mail_routing">Unix to Unix CoPy
+(UUCP)</a>:</p>
 <blockquote>
 <p>…!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 judges@toad.com</p>

1993/README.md

@@ -33,7 +33,8 @@ See [How to contact the IOCCC](../contact.html) for how to provide
 us with your comments and suggestions today.
 
 For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:
+people used to contact the IOCCC in this given year, via [Unix to Unix CoPy
+(UUCP)](https://en.wikipedia.org/wiki/UUCP#Mail_routing):
 
 >   ...!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 >   judges@toad.com

1993/index.html

@@ -418,7 +418,8 @@ Also include anything else that you would like to see in future contests.
 See <a href="../contact.html">How to contact the IOCCC</a> for how to provide
 us with your comments and suggestions today.</p>
 <p>For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:</p>
+people used to contact the IOCCC in this given year, via <a href="https://en.wikipedia.org/wiki/UUCP#Mail_routing">Unix to Unix CoPy
+(UUCP)</a>:</p>
 <blockquote>
 <p>…!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 judges@toad.com</p>

1994/README.md

@@ -101,7 +101,8 @@ See [How to contact the IOCCC](../contact.html) for how to provide
 us with your comments and suggestions today.
 
 For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:
+people used to contact the IOCCC in this given year, via [Unix to Unix CoPy
+(UUCP)](https://en.wikipedia.org/wiki/UUCP#Mail_routing):
 
 >   ...!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 >   judges@toad.com

1994/index.html

@@ -469,7 +469,8 @@ Also include anything else that you would like to see in future contests.
 See <a href="../contact.html">How to contact the IOCCC</a> for how to provide
 us with your comments and suggestions today.</p>
 <p>For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:</p>
+people used to contact the IOCCC in this given year, via <a href="https://en.wikipedia.org/wiki/UUCP#Mail_routing">Unix to Unix CoPy
+(UUCP)</a>:</p>
 <blockquote>
 <p>…!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 judges@toad.com</p>

1995/README.md

@@ -50,7 +50,8 @@ See [How to contact the IOCCC](../contact.html) for how to provide
 us with your comments and suggestions today.
 
 For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:
+people used to contact the IOCCC in this given year, via [Unix to Unix CoPy
+(UUCP)](https://en.wikipedia.org/wiki/UUCP#Mail_routing):
 
 >   ...!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 >   judges@toad.com

1995/index.html

@@ -432,7 +432,8 @@ Also include anything else that you would like to see in future contests.
 See <a href="../contact.html">How to contact the IOCCC</a> for how to provide
 us with your comments and suggestions today.</p>
 <p>For those who appreciate a bit of Internet history, this is how
-people used to contact the IOCCC in this given year:</p>
+people used to contact the IOCCC in this given year, via <a href="https://en.wikipedia.org/wiki/UUCP#Mail_routing">Unix to Unix CoPy
+(UUCP)</a>:</p>
 <blockquote>
 <p>…!{sun,pacbell,uunet,pyramid}!hoptoad!judges<br>
 judges@toad.com</p>