Add LC to instruction material section

Author: Chris Erdmann

LICENSE.md

@@ -5,7 +5,7 @@ root: .
 ---
 ## Instructional Material
 
-All Software Carpentry and Data Carpentry instructional material is
+All Software Carpentry, Data Carpentry, and Library Carpentry instructional material is
 made available under the [Creative Commons Attribution
 license][cc-by-human]. The following is a human-readable summary of
 (and not a substitute for) the [full legal text of the CC BY 4.0