Prepare 0.9.0 release
Lock changelog for 0.9.0
add motion: double ` for going back to previous position
fix the E selection bug

by change find the next buffer position method
add the test for the situation
Merge pull request #234 from tony612/fix-motion-E-selection-bug

Fix the E selection bug
Add @tony612's fix to changelog
Merge pull request #233 from guanlun/master

add motion: double ` for going back to previous position
Add @guanlun's fix to changelog
Merge branch 'master' into undo-typing