Version bump

build.gradle

@@ -50,7 +50,7 @@ file "build.properties" withReader {
  *    The version number is a sacred tool that a computer must understand and be able to compare to see what's what.
  *    `-SNAPSHOT` or `.rc0v14s4dffds2` communicates nothing useful.
  */
-version = "0.21.5" // To be clear, you can edit this if you are submitting a patch PR, or if you are merging a feature into master.
+version = "0.21.6" // To be clear, you can edit this if you are submitting a patch PR, or if you are merging a feature into master.
 if (System.getenv().BUILD_NUMBER != null) version += "." + System.getenv().BUILD_NUMBER
 
 group = "net.dries007.tfc" // According to java standards, as I have control over this domain. If you fork this and release your own version, change this.