Minor tweaks to the language matrix markdown documentation.
diff --git a/LANGUAGES.md b/LANGUAGES.md
index e7f3108..add3ae5 100644
--- a/LANGUAGES.md
+++ b/LANGUAGES.md
@@ -57,7 +57,7 @@
<td align=left><a href="lib/cpp/README.md">C++</a></td>
<!-- Since -----------------><td>0.2.0</td>
<!-- Build Systems ---------><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
-<!-- Language Levels -------><td colspan=2>C++98, gcc </td>
+<!-- Language Levels -------><td colspan=2>C++98</td>
<!-- Low-Level Transports --><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
<!-- Transport Wrappers ----><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
<!-- Protocols -------------><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
@@ -133,8 +133,8 @@
<tr align=center>
<td align=left><a href="lib/netcore/README.md">.NET Core</a></td>
<!-- Since -----------------><td>0.11.0</td>
-<!-- Build Systems ---------><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cred.png" alt=""/></td>
-<!-- Language Levels -------><td>2.0.0</td><td>2.0.5</td>
+<!-- Build Systems ---------><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cred.png" alt=""/></td>
+<!-- Language Levels -------><td>2.0.0</td><td>2.1.4</td>
<!-- Low-Level Transports --><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
<!-- Transport Wrappers ----><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cred.png" alt=""/></td>
<!-- Protocols -------------><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
@@ -189,7 +189,7 @@
<td align=left><a href="lib/java/README.md">Java (SE)</a></td>
<!-- Since -----------------><td>0.2.0</td>
<!-- Build Systems ---------><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
-<!-- Language Levels -------><td>1.7.0_151</td><td>1.8.0_144</td>
+<!-- Language Levels -------><td>1.7.0_151</td><td>1.8.0_151</td>
<!-- Low-Level Transports --><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
<!-- Transport Wrappers ----><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
<!-- Protocols -------------><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>
@@ -299,7 +299,7 @@
<td align=left><a href="lib/rs/README.md">Rust</a></td>
<!-- Since -----------------><td>0.11.0</td>
<!-- Build Systems ---------><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cred.png" alt=""/></td>
-<!-- Language Levels -------><td>1.15.1</td><td>1.18.0</td>
+<!-- Language Levels -------><td>1.15.1</td><td>1.21.0</td>
<!-- Low-Level Transports --><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cred.png" alt=""/></td>
<!-- Transport Wrappers ----><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cred.png" alt=""/></td>
<!-- Protocols -------------><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td><td><img src="doc/images/cred.png" alt=""/></td><td><img src="doc/images/cgrn.png" alt="Yes"/></td>