Rename VERSION to VERSION.info to avoid conflicts with modern STL

On case-insensitive file systems (e.g., macOS), inclusion of the new
standard <version> header resulted in unexpected inclusion of VERSION
file.

Change-Id: Ib08d8e9efa0f6ed0cee6843b818b773485dc73d8
diff --git a/.gitignore b/.gitignore
index 608c272..8850587 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,4 +26,4 @@
 *.py[cod]
 
 # Other
-/VERSION
+/VERSION.info