xo: Disable lines-between-class-members rule.

Apparently this doesn't work well with typescript files.
For example this will throw this linting error:
class Test {
  a: boolean;
  b: string; // needs a new line before this one to fix this linting error
}

package.json

@@ -193,7 +193,8 @@
           "prefer-promise-reject-errors": 0,
           "import/no-unresolved": 0,
           "import/no-extraneous-dependencies": 0,
-          "no-prototype-builtins": 0
+          "no-prototype-builtins": 0,
+          "lines-between-class-members": 0
         }
       }
     ],