Add support clause to license block.

To protect ourselves against any backlash for shoving away modpack-related bugs, we're now making modpack owners responsable for support. Also, please no more 1.5.x backport requests D:

README.md

@@ -11,7 +11,7 @@ Run [Apache Ant](http://ant.apache.org/bindownload.cgi) in the repository root:
 Please include the following:
 
 * Minecraft version
-* TinkersConstruct version
+* Tinkers Construct version
 * Forge version/build
 * Versions of any mods potentially related to the issue 
 * Any relevant screenshots are greatly appreciated.
@@ -24,4 +24,8 @@ Most code is public domain under [Creative Commons 0](http://creativecommons.org
 
 Textures and binaries are licensed under [Creative Commons 3](http://creativecommons.org/licenses/by/3.0/).
 
+Any modpack which uses Tinkers' Construct takes **full** responsability for user support queries. For anyone else, we only support official builds from the main CI server, not custom built jars. We also do not take bug reports for outdated builds of Minecraft.
+
+If you have queries about any license or the above support restrictions, please drop by our IRC channel, #TinkersConstruct on irc.esper.net
+
 Any alternate licenses are noted where appropriate.