Merge pull request #37 from vorburger/UncheckedIOException

Use UncheckedIOException instead of RuntimeException

src/main/java/io/ipfs/cid/Cid.java

@@ -102,7 +102,7 @@ private byte[] toBytesV1() {
             super.serialize(res);
             return res.toByteArray();
         } catch (IOException e) {
-            throw new RuntimeException(e);
+            throw new UncheckedIOException(e);
         }
     }