Update CHANGELOG.

CHANGELOG.md

@@ -10,7 +10,7 @@ that users understand how the changes affect the new version.
 -->
 version 3.1.0
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-+ Isoseq3: Required more memory for common datasets.
++ Isoseq3: Requires more memory by default, is now 2G.
 + Isoseq3: Remove cp commands and other bash magic, file naming is now solved by pipeline.
 + Lima: Replace mv command with cp.
 + Add WDL task for smoove (lumpy) sv-caller.