Pururin - fix pages (#470)

Pururin fix pages

src/all/pururin/build.gradle

@@ -1,7 +1,7 @@
 ext {
     extName = 'Pururin'
     extClass = '.PururinFactory'
-    extVersionCode = 7
+    extVersionCode = 8
     isNsfw = true
 }
 

src/all/pururin/src/eu/kanade/tachiyomi/extension/all/pururin/Pururin.kt

@@ -150,7 +150,7 @@ abstract class Pururin(
     override fun pageListParse(document: Document): List<Page> {
         return document.select(".gallery-preview a img")
             .mapIndexed { i, img ->
-                Page(i, "", img.attr("abs:src").replace("t.", "."))
+                Page(i, "", (if (img.hasAttr("abs:src")) img.attr("abs:src") else img.attr("abs:data-src")).replace("t.", "."))
             }
     }