Change 'Email' to 'email' in contact.{md,html}

Although 'Email' is sometimes used it feels more out of place in the
middle of a sentence. There might be other files where this could be
done but at the same time there are files that this should not be done -
like source code.

contact.md

@@ -1,4 +1,4 @@
-# WAIT!!! - Before you send that Email
+# WAIT!!! - Before you send that email
 
 If you are trying to:
 
@@ -6,7 +6,7 @@ If you are trying to:
 * **Update winning author information** - See [FAQ 5.5](faq.html#fix_author)
 * **Correct a website problem** - See [FAQ 5.4](faq.html#fix_web_site) or [FAQ 5.6](faq.html#fix_link)
 
-Instead of sending us Email, **Please** consider using the [GitHub
+Instead of sending us email, **Please** consider using the [GitHub
 pull request](https://github.com/ioccc-src/winner/pulls) process
 against the [master branch](https://github.com/ioccc-src/winner/branches)
 of the [ioccc-src/winner repo](https://github.com/ioccc-src/winner).
@@ -49,14 +49,14 @@ See "[FAQ 6.12: What is Mastodon and why does IOCCC use it?](faq.html#try_mastod
 information on Mastodon.
 
 
-# If you really need to send Email the IOCCC judges
+# If you really need to send email the IOCCC judges
 
 Did you look at the above section?
 
 If you must contact the IOCCC judges by email, then please send email to:
 [q.YYYY@ioccc.org](mailto:q.YYYY@ioccc.org?subject=IOCCC%20YYYY%20question%20<===%20You%20MUST%20change%20YYYY%20to%20the%204-digit%20year%20in%20both%20the%20To%20address%20and%20Subject,%20then%20remove%20this%20arrow%20note%20from%20the%20subject%20line!)
 
-**IMPORTANT:** The _YYYY_ in the above Email address **MUST** be changed to the current 4 digit year!
+**IMPORTANT:** The _YYYY_ in the above email address **MUST** be changed to the current 4 digit year!
 
 You **MUST** include the following two words (separated by a space) in the subject of your email, otherwise the email will be rejected:
 
@@ -64,7 +64,7 @@ You **MUST** include the following two words (separated by a space) in the subje
     IOCCC YYYY
 ```
 
-**IMPORTANT:** The _YYYY_ in the above Email address **MUST** be changed to the current 4 digit year!
+**IMPORTANT:** The _YYYY_ in the above email address **MUST** be changed to the current 4 digit year!
 
 
 <hr style="width:10%;text-align:left;margin-left:0">