Keep LICENCE.txt with LF as line endings for easy hashing
diff --git a/.gitattributes b/.gitattributes
index e29707e..9e88eb4 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -13,3 +13,5 @@
 # Keep the single include header with LFs to make sure it is uploaded,
 # hashed etc with LF
 single_include/*.hpp eol=lf
+# Also keep the LICENCE file with LFs for the same reason
+LICENCE.txt eol=lf