Test warning fix for Issue 48: incorrect return type of GetUint64()

git-svn-id: https://rapidjson.googlecode.com/svn/trunk@87 c5894555-1306-4e8d-425f-1f6f381ee07c

test/unittest/valuetest.cpp

@@ -263,7 +263,7 @@ TEST(Value, Uint64) {
 	// SetUint64()
 	Value z;
 	z.SetUint64(1234);
-	EXPECT_EQ(1234, z.GetUint64());
+	EXPECT_EQ(1234u, z.GetUint64());
 
 	z.SetUint64(2147483648LL);	// 2^31, cannot cast as int
 	EXPECT_FALSE(z.IsInt());