Get full-size imgur images when ripping reddit users

Closes #142

src/main/java/com/rarchives/ripme/utils/RipUtils.java

@@ -81,7 +81,7 @@ public class RipUtils {
                                     .userAgent(AbstractRipper.USER_AGENT)
                                     .get();
                 for (Element el : doc.select("meta")) {
-                    if (el.attr("property").equals("og:image")) {
+                    if (el.attr("name").equals("twitter:image:src")) {
                         result.add(new URL(el.attr("content")));
                         return result;
                     }