Added Hitomi Ripper unit test

src/test/java/com/rarchives/ripme/tst/ripper/rippers/HitomiRipperTest.java

@@ -0,0 +1,13 @@
+package com.rarchives.ripme.tst.ripper.rippers;
+
+import java.io.IOException;
+import java.net.URL;
+
+import com.rarchives.ripme.ripper.rippers.HitomiRipper;
+
+public class HitomiRipperTest extends RippersTest {
+    public void testRip() throws IOException {
+        HitomiRipper ripper = new HitomiRipper(new URL("https://hitomi.la/galleries/975973.html"));
+        testRipper(ripper);
+    }
+}