patch 8.0.0763: libvterm can be improved

Problem:    Libvterm can be improved.
Solution:   Various small improvements, more comments.
diff --git a/src/libvterm/README b/src/libvterm/README
index ef74b01..8d4de39 100644
--- a/src/libvterm/README
+++ b/src/libvterm/README
@@ -1,13 +1,12 @@
 This is a MODIFIED version of libvterm.
 
 The original can be found:
-On the original site (tar archive and Bazaar repository):
+- on the original site (tar archive and Bazaar repository):
 	http://www.leonerd.org.uk/code/libvterm/
-Cloned on Github:
+- cloned on Github:
 	https://github.com/neovim/libvterm
 
 Modifications:
 - Add a .gitignore file.
 - Convert from C99 to C90.
 - Other changes to support embedding in Vim.
--