Update checkstyle rules to allow sensible isRubyRange use.

Author: aardvark179

src/main/.checkstyle_checks.xml

@@ -211,7 +211,7 @@
       <property name="message" value="Don't use transferToInterpreterOnException"/>
     </module>
     <module name="RegexpSinglelineJava">
-      <property name="format" value='"isRuby(?!Value|DynamicObject|SymbolOrString|Rational|[^"]+\|\|)'/> <!-- Rational is not a builtin type -->
+      <property name="format" value='"isRuby(?!Value|DynamicObject|SymbolOrString|Rational|Range|[^"]+\|\|)'/> <!-- Rational is not a builtin type -->
       <property name="message" value="Type the argument instead of using a positive isRuby* guard."/>
     </module>
     <module name="RegexpSinglelineJava">