v4.0.0

• BREAKING: drop support for TS < 2.8 (we're now using tsutils 3.x)
• [bugfix] jsx-curly-spacing fix false positive with render props (#140)
• [bugfix] jsx-key fix error detection in parenthesized expression (#181)
• [bugfix] jsx-wrap-multiline fix for closing parenthesis (#194)
• [enhancement] jsx-space-before-trailing-slash add auto fixer (#182)
• [enhancement] jsx-self-close add auto fixer (#189)