Remove extra newlines in CHANGELOG (#170)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e26b712..d5a22f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,15 +2,11 @@
 
 * Add a `StreamCloser` class, which is a `StreamTransformer` that allows the
   caller to force the stream to emit a done event.
-
 * Added `ChunkedStreamReader` for reading _chunked streams_ without managing
   buffers.
-
 * Add extensions on `StreamSink`, including `StreamSink.transform()` for
   applying `StreamSinkTransformer`s and `StreamSink.rejectErrors()`.
-
 * Add `StreamGroup.isIdle` and `StreamGroup.onIdle`.
-
 * Add `StreamGroup.isClosed` and `FutureGroup.isClosed` getters.
 
 ## 2.5.0