OrganizeImports v0.4.0

Improvements:

• Remove unneeded curly-braces in imports with only a single name imported (#97, #96)
• Remove duplicate importees (#82, #81)
• Allow -Xlint in OrganizeImports.removeUnused (#80)
• Cross-build to 2.13 (#69)
• Skip package object parent symbols when expanding relative imports (#58, #55)
• Do not rewrite already organized imports formatted by Scalafmt (#46, #44, #43)

Bug fixes:

• Imports may be sorted in wrong order when some of them are not rewritten (#85, #84)
• Invalid code generated due to inheritance (#78, #65)
• Infinite loop caused by missing symbol information (#90, #75, #64)
• Do not remove _root_ while expanding relative imports (#63, #62)
• Handling edge cases caused by explicitly imported implicit names (#30, #61, #59, #40)
• Remove unused local imports (#49, #46)
• Fix test Codecov test coverage report (#70, #54)

Huge thanks to the following contributors for this release!

• Brice Jaglin
• David Barri
• Lorenzo Gabriele
• Manu Zhang
• Taisuke Oe

Please refer to the v0.4.0 milestone for a complete list of features and fixes.