Allow enclosing selection in triangular braces

This doesn't turn `<...>` into a brace pair, only allows enclosing
selection into triangular braces by pressing `<`.

Author: taminomara

language-configuration.json

@@ -23,7 +23,8 @@
 		["{", "}"],
 		["\"", "\""],
 		["'", "'"],
-		["`", "`"]
+		["`", "`"],
+		["<", ">"]
 	],
 	"folding": {
 		"markers": {