[squash] Make v5/v0.10/v0.12 not bold in CHANGELOG

Make v5, v0.10, v0.12 not bold in the CHANGELOG.md, as bold is said to
be an indication of the most recent actively supported release futher
on the same page.

CHANGELOG.md

@@ -56,7 +56,7 @@ release.
 <a href="doc/changelogs/CHANGELOG_V6.md#6.0.0">6.0.0</a><br/>
   </td>
   <td valign="top">
-<b><a href="doc/changelogs/CHANGELOG_V5.md#5.11.1">5.11.1</a></b><br/>
+<a href="doc/changelogs/CHANGELOG_V5.md#5.11.1">5.11.1</a><br/>
 <a href="doc/changelogs/CHANGELOG_V5.md#5.11.0">5.11.0</a><br/>
 <a href="doc/changelogs/CHANGELOG_V5.md#5.10.1">5.10.1</a><br/>
 <a href="doc/changelogs/CHANGELOG_V5.md#5.10.0">5.10.0</a><br/>
@@ -107,7 +107,7 @@ release.
 <a href="doc/changelogs/CHANGELOG_V4.md#4.0.0">4.0.0</a><br/>
   </td>
   <td valign="top">
-<b><a href="doc/changelogs/CHANGELOG_V012.md#0.12.18">0.12.18</a></b><br/>
+<a href="doc/changelogs/CHANGELOG_V012.md#0.12.18">0.12.18</a><br/>
 <a href="doc/changelogs/CHANGELOG_V012.md#0.12.17">0.12.17</a><br/>
 <a href="doc/changelogs/CHANGELOG_V012.md#0.12.16">0.12.16</a><br/>
 <a href="doc/changelogs/CHANGELOG_V012.md#0.12.15">0.12.15</a><br/>
@@ -128,7 +128,7 @@ release.
 <a href="doc/changelogs/CHANGELOG_V012.md#0.12.0">0.12.0</a><br/>
   </td>
   <td valign="top">
-<b><a href="doc/changelogs/CHANGELOG_V010.md#0.10.48">0.10.48</a></b><br/>
+<a href="doc/changelogs/CHANGELOG_V010.md#0.10.48">0.10.48</a><br/>
 <a href="doc/changelogs/CHANGELOG_V010.md#0.10.47">0.10.47</a><br/>
 <a href="doc/changelogs/CHANGELOG_V010.md#0.10.46">0.10.46</a><br/>
 <a href="doc/changelogs/CHANGELOG_V010.md#0.10.45">0.10.45</a><br/>