Release 0.28.4

Bugs fixed

* CDX formatting now percent encodes spaces, newlines and null characters in all string fields. This is non-standard but at least prevents us outputting invalid CDX lines.
* CdxRequestEncoder now handles requests with an invalid content-type header

pom.xml

@@ -9,7 +9,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.netpreserve</groupId>
     <artifactId>jwarc</artifactId>
-    <version>0.28.3</version>
+    <version>0.28.4</version>
 
     <name>jwarc</name>
     <description>Java library for reading and writing WARC files with a typed API</description>