Add release notes.

release-notes.md

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+*v0.4.11*
+- Fix display error on scrolling over an empty section with a header (#83).
+- Work around for items without layout params (#74).
+- Update to support libs v22.1.1 (#76).
+
+*v0.4.10.1*
+- Remove unneeded library drawables (default launcher icons) (#80) - @kingargyle.
+
+*v0.4.10*
+- Add static factory method to preserve margin layout parameters (#73) - @adi1133.
+- Fix overscroll after notifyDataSetChanged() is called (#70).
+
+*v0.4.9.1*
+- Change minSdk to 9 (#72).
+- Add read me disclaimer for support only from API 15+.
+
+*v0.4.9*
+- Fix jumpy layout when scrolling with header as last item (#67).
+
+*v0.4.8*
+- Fix RCE on change to smaller data set (#65).
+
+*v0.4.7*
+- Fix NPE when computing scroll indicator (#62).
+
+*v0.4.6*
+- Fix scroll to start over section with one item (#60).
+
+*v0.4.5*
+- Fix scroll at content end with grid (#55). Thank you @Eifelschaf for your help.
+- Lots of minor fixes.
+
+*v0.4.4*
+- Fix regression spamming onCreateViewHolder (#50).
+