Scheme: Added support for rational number literals (#1964)

This adds support for rational numbers like `2/3`.

Author: RunDevelopment

components/prism-scheme.js

@@ -17,7 +17,7 @@ Prism.languages.scheme = {
 		lookbehind: true
 	},
 	'number': {
-		pattern: /([\s()])[-+]?\d*\.?\d+(?:\s*[-+]\s*\d*\.?\d+i)?\b/,
+		pattern: /([\s()])[-+]?(?:\d+\/\d+|\d*\.?\d+(?:\s*[-+]\s*\d*\.?\d+i)?)\b/,
 		lookbehind: true
 	},
 	'boolean': /#[tf]/,

components/prism-scheme.min.js

@@ -1,5 +1,6 @@
 (foo 42)
 (foo 3.14159)
+(foo 8/3)
 (foo 3+4i)
 (foo 2.5+0.0i)
 (foo 3+0i)
@@ -9,11 +10,12 @@
 [
 	["punctuation", "("], ["function", "foo"], ["number", "42"], ["punctuation", ")"],
 	["punctuation", "("], ["function", "foo"], ["number", "3.14159"], ["punctuation", ")"],
+	["punctuation", "("], ["function", "foo"], ["number", "8/3"], ["punctuation", ")"],
 	["punctuation", "("], ["function", "foo"], ["number", "3+4i"], ["punctuation", ")"],
 	["punctuation", "("], ["function", "foo"], ["number", "2.5+0.0i"], ["punctuation", ")"],
 	["punctuation", "("], ["function", "foo"], ["number", "3+0i"], ["punctuation", ")"]
 ]
 
 ----------------------------------------------------
 
-Checks for numbers and complex numbers.
+Checks for numbers, rational numbers, and complex numbers.