New rules

• Add @typescript-eslint/class-literal-property-style rule
• Add @typescript-eslint/prefer-readonly-parameter-types rule
• Add @typescript-eslint/no-base-to-string rule
• Add @typescript-eslint/keyword-spacing rule
• Add @typescript-eslint/method-signature-style rule
• Add @typescript-eslint/prefer-reduce-type-parameter rule
• Add @typescript-eslint/no-floating-promises rule
• Re-enable some disabled rules xojs/eslint-config-xo-typescript@e870168

Fixes

• Lock prettier dependency at 2.0.4 until we can resolve #466
• Prevent extraneous newline from --stdin --fix (#460) 07e2762

v0.29.1...v0.30.0