ignore/types: add texinfo

https://www.gnu.org/software/texinfo/

PR BurntSushi#1934

Author: jgarte

crates/ignore/src/default_types.rs

@@ -226,6 +226,7 @@ pub const DEFAULT_TYPES: &[(&str, &[&str])] = &[
     ("taskpaper", &["*.taskpaper"]),
     ("tcl", &["*.tcl"]),
     ("tex", &["*.tex", "*.ltx", "*.cls", "*.sty", "*.bib", "*.dtx", "*.ins"]),
+    ("texinfo", &["*.texi"]),
     ("textile", &["*.textile"]),
     ("tf", &["*.tf"]),
     ("thrift", &["*.thrift"]),