Fix link to 2.1.8 (it should be make dist not git archive)

Author: azat

index.html

@@ -136,7 +136,7 @@ <h3>Download&ndash;Stable releases</h3>
    like to track the latest development versions and report bugs in them.
 
    <ul class="tight">
-   <li><a class="latest" href="https://github.com/libevent/libevent/archive/release-2.1.8-stable.tar.gz">libevent-2.1.8-stable.tar.gz</a> <a href="https://raw.githubusercontent.com/libevent/libevent/release-2.1.8-stable/ChangeLog">ChangeLog</a><br>Released 2017-01-22
+   <li><a class="latest" href="https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz">libevent-2.1.8-stable.tar.gz</a> [<a href="https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz.asc">GPG Sig</a>] <a href="https://raw.githubusercontent.com/libevent/libevent/release-2.1.8-stable/ChangeLog">ChangeLog</a><br>Released 2017-01-22
      <ul>
        <li>Changelog to follow
      </ul>
@@ -345,7 +345,7 @@ <h3>Programs using libevent</h3>
  use the mailing list or the IRC channel.)<br>
 <!-- Created: Mon Mar 11 12:43:06 EST 2002 -->
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-Last modified: 10 Jan 2015
+Last modified: 29 Jan 2017
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