Update changelog: log4j removal
Fixes #TIKA-3935
Release 2.6.1 - ???
+ * Remove log4j 1.2.x (and slf4j-log4j12 which now redirects to slf4j-reload4j) from
+ all modules (TIKA-3935).
+
* Add SVG detection for svg files lacking the xml header (TIKA-3308).
* Upgrade to Bouncy Castle 1.71 and jdk18on jars (TIKA-3933).
